Method for multiplexing uplink control information in wireless communication system, and apparatus using same

Abstract

To provide an uplink control information multiplexing method and apparatus in a wireless communication system.SOLUTION: User equipment of a wireless communication system comprises a communication module and a processor. The processor receives DCI (downlink control information) of a PDCCH (physical downlink control channel) for scheduling PUSCH (physical uplink shared channel) transmission over a plurality of slots and, by applying a value in a DAI (downlink assignment index) field of the DCI to each slot where HARQ (hybrid automatic repeat request)-ACK information is multiplexed to the PUSCH transmission over the plurality of slots, multiplexes the HARQ-ACK information to the PUSCH transmission.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a wireless communication system, and more particularly to an uplink control information multiplexing method and an apparatus using the same for the wireless communication system. [Background technology]

[0002] After the commercialization of the fourth-generation (4G) communication system, efforts are underway to develop a new fifth-generation (5G) communication system to meet the increasing demand for wireless data traffic. 5G communication systems are also called post-4G network communication systems, post-LTE systems, or new radio (NR) systems. To achieve high data rates, 5G communication systems include systems that operate using millimeter wave (mmWave) bands above 6 GHz, and also include communication systems that operate using frequency bands below 6 GHz to ensure coverage. As a result, implementation forms for base stations and terminals are under consideration.

[0003] The 3rd Generation Partnership Project (3GPP®) NR system increases network spectral efficiency, enabling communication providers to offer more data and voice services over a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmissions in addition to supporting large amounts of voice. The advantages of the NR system are higher throughput and lower latency on the same platform, support for frequency division duplexing (FDD) and time division duplexing (TDD), and low operating costs with an enhanced end-user environment and simple architecture.

[0004] For more efficient data processing, the dynamic TDD of the NR system may use a method for changing the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used in the uplink and downlink according to the data traffic direction of a cell user. For example, when the downlink traffic of a cell is larger than the uplink traffic, the base station may allocate more downlink OFDM symbols to a slot (or subframe). Information about the slot configuration should be transmitted to the terminal.

[0005] To mitigate the path loss and extend the transmission distance of radio waves in the mmWave band, 5G communication systems are discussing beamforming, massive multiple-input / output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming (combining analog and digital beamforming), and large-scale antenna technologies. In addition, to improve the system network, technologies related to evolved small cells, advanced small cells, cloud radio access networks (Cloud RAN), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), mobile networks, cooperative communication, coordinated multipoint (CoMP), interference cancellation, etc. are being developed in 5G communication systems. In addition, advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced connectivity techniques such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) are under development for 5G systems.

[0006] Meanwhile, in a human-centered connected network where humans generate and consume information, the Internet is evolving into the Internet of Things (IoT) network, which exchanges information among distributed components such as objects. Internet of Everything (IoE) technology is also emerging, combining IoT technology with big data processing technology through connections to cloud servers. Implementing IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology. As a result, in recent years, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have been considered for connecting objects. In an IoT environment, intelligent Internet technology (IT) services can be provided that collect and analyze data generated by connected objects to create new value in human life. Through the integration and blending of existing information technology (IT) with various industries, IoT can be applied to areas such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, health management, smart home appliances, and advanced medical services.

[0007] Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are implemented using techniques such as beamforming, MIMO, and array antennas. The application of Cloud RAN as a big data processing technology described above is an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems are being developed to provide voice services while guaranteeing user activity.

[0008] However, mobile communication systems have gradually expanded beyond voice services to include data services, and have now been developed to the extent that they provide high-speed data services. However, due to the resource shortage phenomenon in currently available mobile communication systems and users' demand for high-speed services, more advanced mobile communication systems are needed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Special Publication No. 2014-519252 [Non-patent literature]

[0010] [Non-Patent Document 1] NTT DOCOMO, INC., DL / UL scheduling and HARQ management, 3GPP TSG RAN WG1 #90b R1-1718217, October 3, 2017,<URL:http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_90b / Docs / R1-1718217.zip> [Non-patent document 2] Qualcomm Incorporated,Summary of remaining issues for UCI multiplexing on PUSCH,3GPP TSG RAN WG1 #92b R1-1805666,April 19, 2018,<URL:http: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_92b / Docs / R1-1805666.zip> Summary of the Invention [Problem to be solved by the invention]

[0011] An object of an embodiment of the present invention is to provide a method and apparatus for efficiently transmitting signals from a wireless communication system, and also to provide a method and apparatus for multiplexing uplink control information in a wireless communication system. [Means for solving the problem]

[0012] A terminal of a wireless communication system according to an embodiment of the present invention includes a communication module and a processor for controlling the communication module, wherein the processor receives DCI of a physical downlink control channel (PDCCH) that schedules PUSCH (physical uplink shared channel) transmissions on a plurality of slots, and multiplexes hybrid automatic repeat request (HARQ)-ACK information onto the PUSCH transmissions on the plurality of slots by applying a value of a downlink assignment index (DAI) field of the DCI to each of the plurality of slots.

[0013] The processor may determine the number of bits of the HARQ-ACK information according to the value of the DAI field of the DCI for each slot in which the HARQ-ACK information is multiplexed into PUSCH transmission on the plurality of slots.

[0014] When a dynamic HARQ-ACK codebook is configured in the terminal, the processor may determine the remainder when the number of bits of the HARQ-ACK information is divided by 4 according to the value of the DAI field of the DCI for each slot in which the HARQ-ACK information is multiplexed into PUSCH transmission on the plurality of slots.

[0015] The processor may not multiplex the HARQ-ACK information into a PUSCH transmission in a slot where the wireless communication terminal would not transmit the HARQ-ACK information with a physical uplink control channel (PUCCH) in the absence of a PUSCH transmission on the plurality of slots.

[0016] When the wireless communication terminal does not receive a PDSCH in which success or failure of reception is indicated by HARQ-ACK information to be transmitted in a specific slot that is one of the plurality of slots, the processor may not multiplex the HARQ-ACK information in the specific slot into PUSCH transmission on the plurality of slots.

[0017] When the wireless communication terminal does not receive a PDCCH scheduling transmission of a PUCCH including HARQ-ACK information to be transmitted in a specific slot that is one of the plurality of slots, the processor may not multiplex the HARQ-ACK information into PUSCH transmission on the plurality of slots in the specific slot.

[0018] The processor may multiplex HARQ-ACK information, in which the success or failure of reception of the physical uplink shared channel (PDSCH) is set to NACK, into PUSCH transmission on the plurality of slots other than the slot indicated by the PDSCH-to-HARQ_feeback timing indicator field of the DCI that schedules PDSCH transmission.

[0019] The processor may not multiplex the HARQ-ACK information into PUSCH transmissions on the plurality of slots in slots other than those indicated by a PDSCH-to-HARQ_feeback timing indicator field of a DCI that schedules a PDSCH (physical uplink shared channel).

[0020] The processor may multiplex the HARQ-ACK information with PUSCH transmissions on the plurality of slots in a specific slot if the specific slot satisfies a processing timing condition of a PDSCH (physical uplink shared channel) whose reception success or failure is indicated by the HARQ-ACK information and a PDCCH (physical uplink control channel) that schedules PUCCH transmission including the HARQ-ACK information. The processing timing condition may be determined by a minimum time required for the terminal to receive a PDCCH and generate valid HARQ-ACK information.

[0021] If a specific slot of the plurality of slots does not satisfy the processing timing conditions of a PDSCH whose reception success or failure is indicated by the HARQ-ACK information and a PDCCH that schedules a PUCCH transmission including the HARQ-ACK information, the processor may not multiplex the HARQ-ACK information into a PUSCH transmission on the plurality of slots in the specific slot.

[0022] If a specific slot, which is one of the plurality of slots, does not meet the processing timing conditions of the PDSCH whose reception success or failure is indicated by the HARQ-ACK information and the PDCCH which schedules the transmission of the PUCCH including the HARQ-ACK information, the processor can set the bit of the HARQ-ACK information corresponding to the PDSCH that does not meet the processing timing conditions to NACK.

[0023] The processor can determine the processing timing condition based on the position of the last symbol of the PDSCH, whose reception success or failure is indicated by the HARQ-ACK information, and the position of the preceding symbol among the start symbol of the PUCCH containing the HARQ-ACK information and the start symbol of the PUSCH transmission on the plurality of slots.

[0024] According to an embodiment of the present invention, a method for operating a terminal in a wireless communication system may include receiving DCI of a physical downlink control channel (PDCCH) that schedules PUSCH (physical uplink shared channel) transmissions on a plurality of slots; and multiplexing hybrid automatic repeat request (HARQ)-ACK information onto PUSCH transmissions by applying a value of a downlink assignment index (DAI) field of the DCI for each slot in which HARQ-ACK information is multiplexed onto PUSCH transmissions on the plurality of slots.

[0025] The step of multiplexing the HARQ-ACK information may include determining the number of bits of the HARQ-ACK information according to the value of a DAI field of the DCI for each slot in which the HARQ-ACK information is multiplexed into PUSCH transmission on the plurality of slots.

[0026] When a dynamic HARQ-ACK codebook is configured in the terminal, the step of determining the number of bits of the HARQ-ACK information may include determining a remainder when the number of bits of the HARQ-ACK information is divided by 4 according to the value of a DAI field of the DCI for each slot in which the HARQ-ACK information is multiplexed into PUSCH transmission on the plurality of slots.

[0027] The step of multiplexing the HARQ-ACK information may include a step of not multiplexing the HARQ-ACK information with a PUSCH transmission in a slot in which the wireless communication terminal would not transmit the HARQ-ACK information with a physical uplink control channel (PUCCH) if there was no PUSCH transmission on the plurality of slots.

[0028] The step of not multiplexing the HARQ-ACK information may include, when the wireless communication terminal does not receive a PDSCH whose reception success or failure is indicated by HARQ-ACK information to be transmitted in a specific slot, which is one of the plurality of slots, not multiplexing the HARQ-ACK information in the specific slot with PUSCH transmission on the plurality of slots.

[0029] The step of not multiplexing the HARQ-ACK information may include the step of not multiplexing the HARQ-ACK information into PUSCH transmission on the plurality of slots in a specific slot when the wireless communication terminal does not receive a PDCCH scheduling transmission of a PUCCH including HARQ-ACK information to be transmitted in the specific slot.

[0030] The step of multiplexing the HARQ-ACK information may include multiplexing HARQ-ACK information, in which the success or failure of reception of the physical uplink shared channel (PDSCH) is set to NACK, into PUSCH transmission on the plurality of slots other than the slot indicated by a PDSCH-to-HARQ_feeback timing indicator field of DCI that schedules PDSCH transmission.

[0031] The step of multiplexing the HARQ-ACK information may include not multiplexing the HARQ-ACK information with PUSCH transmission on the plurality of slots other than the slot indicated by a PDSCH-to-HARQ_feeback timing indicator field of a DCI scheduling a PDSCH (physical uplink shared channel). [Effects of the Invention]

[0032] One embodiment of the present invention provides a method for efficiently multiplexing uplink control information in a wireless communication system and an apparatus using the same.

[0033] The effects obtained from the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system. [Figure 2] FIG. 1 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] 1 is a diagram illustrating physical channels used in a 3GPP system and a typical signal transmission method using the physical channels. [Figure 4] FIG. 1 illustrates an SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5] FIG. 1 illustrates a procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 6] FIG. 1 illustrates a control resource set (CORESET) in which a physical downlink control channel (PUCCH) may be transmitted in a 3GPP NR system. [Figure 7] FIG. 1 illustrates a method for configuring a PDCCH search space in a 3GPP NR system. [Figure 8] FIG. 1 is a conceptual diagram illustrating carrier aggregation. [Figure 9] FIG. 1 is a diagram for explaining single-carrier communication and multi-carrier communication. [Figure 10]A diagram showing an example in which a cross-carrier scheduling technique is applied. [Figure 11] 2A and 2B are block diagrams showing the configurations of a terminal and a base station according to an embodiment of the present invention. [Figure 12] 10 is a diagram illustrating an operation of a terminal according to an embodiment of the present invention multiplexing HARQ-ACK information into PUSCH transmissions on multiple slots. [Figure 13] 10 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention multiplexing HARQ-ACK information into PUSCH transmissions on multiple slots. [Figure 14] 10 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention, in which HARQ-ACK information is multiplexed into PUSCH transmissions on multiple slots. [Figure 15] 10 is a diagram illustrating an operation of a terminal according to another embodiment of the present invention, in which HARQ-ACK information is multiplexed into PUSCH transmissions on multiple slots. [Figure 16] 10 is a diagram illustrating a method for determining whether HARQ-ACK information multiplexing is possible when a terminal according to an embodiment of the present invention multiplexes HARQ-ACK information into PUSCH transmission, based on the last symbol of a PDSCH in which the success or failure of reception is indicated by the HARQ-ACK information and the last symbol of a PDCCH that schedules a PUCCH including HARQ-ACK information. [Figure 17] 10 is a diagram illustrating a method in which a terminal according to an embodiment of the present invention multiplexes HARQ-ACK information into PUSCH transmission based on the HARQ-ACK timing and the last symbol of a PDSCH in which the success or failure of reception is indicated by the HARQ-ACK information, when the terminal multiplexes HARQ-ACK information into PUSCH transmission. [Figure 18] FIG. 10 is a diagram illustrating a method in which, when a terminal according to yet another embodiment of the present invention multiplexes HARQ-ACK information into PUSCH transmission, the terminal multiplexes HARQ-ACK information based on Tproc,1 and the last symbol of the PDSCH, the success or failure of reception of which is indicated by the HARQ-ACK information. DETAILED DESCRIPTION OF THE INVENTION

[0035] The terms used in this specification are currently widely used and general terms that are possible based on the functions of the present invention. However, the terms may be changed according to the intentions, practices, and the emergence of new technologies of those skilled in the art. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, their meanings will be explained in the corresponding description of the present specification. Therefore, it is intended to be clear that the terms used in this specification should be analyzed based not only on the names of the terms but also on the substantial meaning of the terms and content throughout this specification.

[0036] Throughout this specification and the claims that follow, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or may be "electrically connected" to the other element through a third element. Furthermore, unless expressly stated to the contrary, the word "comprising" is understood to imply the inclusion of the stated elements and not the exclusion of any other elements unless otherwise specified. Moreover, limitations such as "equivalent to" or "equivalent to" based on a particular threshold value may be appropriately substituted with "greater than" or "less than," respectively, in some exemplary embodiments.

[0037] The following technologies may be used in various wireless access systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single-Carrier FDMA (SC-FDMA). CDMA may be implemented by wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented by wireless technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented by wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (EUMTS) that uses Evolved UMTS Terrestrial Radio Access (E-UTRA), and LTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP New Radio (NR) is a system designed separately from LTE / LTE-A to support enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type communication (mMTC) services, which are requirements of IMT-2020. For clarity, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0038] Unless otherwise specified herein, a base station may refer to a next-generation Node B (gNB) as defined in 3GPP NR. Furthermore, unless otherwise specified, a terminal may refer to a user equipment (UE). Hereinafter, for ease of understanding, each content will be described separately as an embodiment, but the embodiments may be used in combination with each other. In this disclosure, a configuration of a terminal may refer to a configuration by a base station. Specifically, a base station may transmit a channel or a signal to a terminal and configure parameter values ​​used in the operation of the terminal or the wireless communication system.

[0039] FIG. 1 illustrates an example of a wireless frame structure used in a wireless communication system.

[0040] Referring to FIG. 1, a wireless frame (or radio frame) used in a 3GPP NR system has a length of 10 ms (Δf max N f / 100)*T c ) In addition, a wireless frame includes 10 subframes (SF) of equal size. max =480*103Hz, N f =4096, T c =1 / (Δf ref *N f,ref ), Δf ref =15*103Hz, and N f,ref= 2048. The 10 subframes in one wireless frame may be assigned numbers from 0 to 9. Each subframe may be 1 ms long and may include one or more slots according to the subcarrier spacing. More specifically, in a 3GPP NR system, the subcarrier spacing that can be used is 15*2μkHz, where μ can have values ​​of μ = 0, 1, 2, 3, or 4 as the subcarrier spacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may be used for the subcarrier spacing. One subframe with a length of 1 ms may include 2μ slots. In this case, the length of each slot is 2-μms. The 2μ slots in one subframe may be assigned numbers from 0 to 2μ-1. In addition, the slots in one wireless frame may be assigned numbers from 0 to 10*2μ-1. The time resources may be distinguished by at least one of a wireless frame number (also referred to as a wireless frame index), a subframe number (also referred to as a subframe index), and a slot number (or slot index).

[0041] FIG. 2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.

[0042] Specifically, Figure 2 shows the structure of a resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot includes multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and multiple Resource Blocks (RBs) in the frequency domain. An OFDM symbol also refers to one symbol section. Unless otherwise specified, an OFDM symbol may simply be referred to as a symbol. One RB includes 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, the signal transmitted from each slot is divided into N size,μ grid,x *N RB sc Book subcarrier and Nslot symb may be represented by a resource grid containing N OFDM symbols, where x=DL if the signal is a DL signal and x=UL if the signal is a UL signal. size,μ grid,x represents the number of resource blocks (RBs) according to the subcarrier spacing, which is a component of μ (x is DL or UL), and N slot symb represents the number of OFDM symbols in a slot. RB sc is the number of subcarriers that make up one RB, and N RB sc = 12. Depending on the multiple access scheme, OFDM symbols may be called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols.

[0043] The number of OFDM symbols included in one slot may vary according to the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 14 OFDM symbols, while in the case of an extended CP, one slot may include 12 OFDM symbols. In a particular embodiment, the extended CP may be used only with 60 kHz subcarrier spacing. In FIG. 2, for convenience of explanation, one slot is configured using 14 OFDM symbols as an example, but the embodiments of the present disclosure may be similarly applied to slots having a different number of OFDM symbols. Referring to FIG. 2, each OFDM symbol is N size,μ grid,x *N RB sc The carrier frequency includes four subcarriers. The subcarrier types can be divided into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc).

[0044] One RB is N RB sc A resource may be defined by (e.g., 12) consecutive subcarriers. For reference, a resource configured using one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or tone. Thus, one RB may be defined by N slot symb *N RB sc Each resource element in the resource grid can be uniquely defined within a slot by a pair of indices (k, l), where k ranges from 0 to N in the frequency domain. size,μ grid,x *N RB sc -1, and l is an index ranging from 0 to N in the time domain. slot symb It may be an index numbered up to -1.

[0045] In order for a UE to receive signals from or transmit signals to a base station, the time / frequency of the UE may be synchronized to the time / frequency of the base station because when the base station and the UE are synchronized, the UE can determine the time and frequency parameters needed to demodulate DL signals and transmit UL signals at the appropriate times.

[0046] Each symbol of a radio frame used in time division duplex (TDD), i.e., unpaired spectrum, may be configured with at least one of DL symbols, UL symbols, and flexible symbols. In frequency division duplex (FDD), i.e., paired spectrum, a radio frame used as a DL carrier may be configured with DL symbols or flexible symbols, and a radio frame used as a UL carrier may be configured with UL symbols or flexible symbols. DL symbols allow DL transmission but not UL transmission. UL symbols allow UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL according to the signal.

[0047] Information about each symbol type, i.e., information indicating any one of DL symbols, UL symbols, and flexible symbols, can be configured using cell-specific or common radio resource control (RRC) signals. In addition, information about each symbol type can be additionally configured using UE-specific or dedicated RRC signals. The base station notifies i) the duration of the cell-specific slot configuration, ii) the number of slots with only DL symbols from the beginning of the cell-specific slot configuration period, iii) the number of DL symbols from the first symbol of the slot immediately following the slot with only DL symbols, iv) the number of slots with only UL symbols from the end of the cell-specific slot configuration period, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot with only UL symbols by using cell-specific RRC signals. Here, a symbol that is not configured using either UL symbols or DL ​​symbols is a flexible symbol.

[0048] When information about symbol type is configured using UE-specific RRC signals, the base station can signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal can signal the number of DL symbols among the N slot symb symbols of the corresponding slot for each slot, and the number of UL symbols among the N slot symb symbols of the corresponding slot. In this case, the DL symbols of a slot can be continuously configured using the first symbol to the i-th symbol of the slot. In addition, the UL symbols of a slot can be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, a symbol that is not configured using either UL symbols or DL symbols is a flexible symbol.

[0049] The type of symbol configured using the above RRC signal may be called a semi-static DL / UL configuration. In the semi-static DL / UL configuration previously configured using the RRC signal, the flexible symbol may be indicated as a DL symbol, a UL symbol, or a flexible symbol through dynamic slot format information (SFI: slot format information) transmitted on the physical DL control channel (PDCCH: physical DL control channel). In this case, a DL symbol or a UL symbol configured using the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI that the base station can indicate to the UE.

[0050]

Table 1

[0051] In Table 1, D denotes a DL symbol, U denotes a UL symbol, and X denotes a flexible symbol. As shown in Table 1, up to two DL / UL switches are allowed in one slot.

[0052] FIG. 3 is a diagram illustrating physical channels used in a 3GPP system (e.g., NR) and a typical signal transmission method using the physical channels.

[0053] When a UE is powered on or camps on a new cell, the UE performs an initial cell search (S101). Specifically, the UE may synchronize with a BS during the initial cell search. To this end, the UE may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from a base station to synchronize with the base station and obtain information such as a cell ID. The UE may then receive a physical broadcast channel from the base station and obtain broadcast information in the cell.

[0054] Upon completion of the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information in the PDCCH, so that the UE can acquire system information that is more specific than the system information acquired through the initial cell search (S102). Here, the system information acquired by the UE is cell-common system information for the UE to operate correctly at the physical layer in Radio Resource Control (RRC), and is also referred to as remaining system information or system information block (SIB) 1.

[0055] When a UE first accesses a base station or does not have radio resources for signal transmission, the UE may perform a random access procedure with the base station (operations S103 to S106). First, the UE may transmit a preamble over a physical random access channel (PRACH) (S103) and receive a response message for the preamble from the base station over a PDCCH and a corresponding PDSCH (S104). If the UE receives a valid random access response message, the UE transmits data including the UE's identifier and the like to the base station over a physical uplink shared channel (PUSCH) indicated by a UL grant transmitted from the base station over the PDCCH (S105). Next, the UE waits for reception of a PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH via the UE's identifier (S106), the random access process is terminated. During the random access process, the UE may acquire UE-specific system information required for the UE to operate correctly at the physical layer in the RRC layer. Once the UE acquires UE-specific system information at the RRC layer, the UE enters the RRC connected mode (RRC_CONNECTED mode).

[0056] The RRC layer is used to generate and manage messages for control between a terminal and a wireless access network (RAN). More specifically, the base station and terminal can perform storage management including broadcasting cell system information required for all terminals in the cell, transmission management of paging messages, mobility management and handover, terminal measurement reporting and control thereof, terminal capability management, and device management at the RRC layer. Generally, the update of signals transmitted at the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission / reception period (i.e., transmission time interval, TTI) at the physical layer, so that RRC signals can be maintained unchanged for a long period.

[0057] After the above-described procedure, the UE receives the PDCCH / PDSCH (S107) and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. The format of the DCI may vary depending on the intended use. The uplink control information (UCI) transmitted by the UE to the base station through the UL includes a DL / UL ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI may be included in channel state information (CSI). In a 3GPP NR system, a UE may transmit control information, such as the HARQ-ACK and CSI described above, over the PUSCH and / or PUCCH.

[0058] FIG. 4 shows the SS / PBCH block for initial cell access in a 3GPP NR system.

[0059] When a UE is powered on or wants to access a new cell, it may acquire time and frequency synchronization with the cell and perform an initial cell search procedure. The UE may detect the physical cell identity (NcellID) of the cell during the cell search procedure. To this end, the UE may receive synchronization signals, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from a base station and synchronize to the base station. In this case, the UE may obtain information such as a cell identity (ID).

[0060] With reference to FIG. 4(a), the synchronization signal (SS) will be described in more detail. The synchronization signal can be classified into a PSS and an SSS. The PSS can be used to obtain time-domain synchronization and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. The SSS can be used to obtain frame synchronization and a cell group ID. Referring to FIG. 4(a) and Table 2, an SS / PBCH block can be configured using 20 consecutive RBs (=240 subcarriers) on the frequency axis and four consecutive OFDM symbols on the time axis. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the smallest subcarrier index of the SS / PBCH block is numbered starting from 0. In the first OFDM symbol in which the PSS is transmitted, the base station does not transmit signals through the remaining subcarriers, i.e., subcarriers 0 to 55 and 183 to 239. Additionally, in the third OFDM symbol in which the SSS is transmitted, the base station does not transmit signals through subcarriers 48 to 55 and 183 to 191. The base station transmits a physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block, excluding the above signals.

[0061] [Table 2]

[0062] The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group specifically including three unique identifiers through the combination of three PSSs and SSSs such that each physical layer cell ID is only part of one physical layer cell identifier group. Thus, the physical layer cell IDs N cell ID =3N (1) ID +N (2) ID is an index N ranging from 0 to 335 indicating a physical layer cell identifier group (1) ID and an index N ranging from 0 to 2 indicating a physical layer identifier within the physical layer cell identifier group. (2) ID The UE may detect the PSS and identify one of three unique physical layer identifiers. In addition, the UE may detect the SSS and identify one of 336 physical layer cell IDs associated with the physical layer identifier. In this case, the sequence d of the PSS PSS (n) is as follows:

[0063]

number

[0064] where x(i+7)=(x(i+4)+x(i)) mod 2,

[0065] Given as [x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0].

[0066] Furthermore, the SSS series dSSS (n) is as follows:

[0067]

number

[0068] where: x0(i+7)=(x0(i+4)+x0(i)) mod 2 x1(i+7)=(x1(i+1)+x1(i)) mod 2 and

[0069] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)]=[0 0 0 0 0 0 1] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)]=[0 0 0 0 0 0 1] is given as:

[0070] A 10-ms radio frame may be divided into two 5-ms half-frames. Referring to FIG. 4(b), the slots in which the SS / PBCH blocks are transmitted within each half-frame are described. The slots in which the SS / PBCH blocks are transmitted may be any one of Cases A, B, C, D, and E. In Case A, the subcarrier spacing is 15 kHz, and the start of the SS / PBCH block is the ({2, 8} + 14*n)th symbol. In this case, n = 0 or 1 for carrier frequencies below 3 GHz. Additionally, n = 0, 1, 2, or 3 may be used for carrier frequencies above 3 GHz and below 6 GHz. In Case B, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is {4, 8, 16, 20} + 28*n. In this case, n = 0 for carrier frequencies below 3 GHz. Additionally, n = 0 or 1 may be used for carrier frequencies above 3 GHz and below 6 GHz. In Case C, the subcarrier spacing is 30 kHz and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 for carrier frequencies below 3 GHz. Additionally, n=0, 1, 2, or 3 for carrier frequencies above 3 GHz and below 6 GHz. In Case D, the subcarrier spacing is 120 kHz and the start of the SS / PBCH block is the ({4,8,16,20}+28*n)th symbol. In this case, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 18 for carrier frequencies above 6 GHz. In Case E, the subcarrier spacing is 240 kHz and the start of the SS / PBCH block is the ({8,12,16,20,32,36,40,44}+56*n)th symbol. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies above 6 GHz.

[0071] FIG. 5 shows a procedure for transmitting control information and control channels in a 3GPP NR system. Referring to FIG. 5(a), a base station may add a cyclic redundancy check (CRC) masked (e.g., XORed) with a radio network temporary identifier (RNTI) to control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each control information. The common RNTI used by one or more UEs may include at least one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). In addition, a UE-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. The base station may then perform channel coding (e.g., polar coding) (S204) and then perform rate matching according to the amount of resources used for PDCCH transmission (S206). The base station may then multiplex DCI based on a control channel element (CCE)-based PDCCH structure (S208). Additionally, the base station may apply additional processes, such as scrambling, modulation (e.g., QPSK), and interleaving, to the multiplexed DCI (S210), and then map the DCI to resources to be transmitted. A CCE is a basic resource unit for the PDCCH, and one CCE may include multiple (e.g., 6) resource element groups (REGs). One REG may be configured with multiple (e.g., 12) REs. The number of CCEs used for one PDCCH may be defined as an aggregation level.In a 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 may be used. Figure 5(b) is a diagram relating to CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control area accordingly.

[0072] FIG. 6 illustrates a control resource set (core set) in which a physical downlink control channel (PUCCH) may be transmitted in a 3GPP NR system.

[0073] A core set is a time-frequency resource within which the PDCCH, i.e., a control signal for the UE, is transmitted. In addition, a search space, which will be described later, may be mapped to a core set. Thus, rather than monitoring all frequency bands for PDCCH reception, the UE may monitor a time-frequency region designated as a core set and decode the PDCCH mapped to the core set. A base station may configure one or more core sets for a UE per cell. A core set may be configured using up to three consecutive symbols on the time axis. Additionally, a core set may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of FIG. 6, core set #1 is configured using consecutive PRBs, and core sets #2 and #3 are configured using non-consecutive PRBs. Core sets may be positioned within any symbol within a slot. For example, in the embodiment of FIG. 6, core set #1 starts in the first symbol of the slot, core set #2 starts in the fifth symbol of the slot, and core set #3 starts in the ninth symbol of the slot.

[0074] FIG. 7 illustrates a method for configuring a PUCCH search space in a 3GPP NR system.

[0075] To transmit a PDCCH to a UE, each core set may have at least one search space. In an embodiment of the present disclosure, a search space is a set of all time-frequency resources (hereinafter referred to as PDCCH candidates) through which the UE's PDCCH can be transmitted. The search space may include a common search space that 3GPP NR UEs are required to search in common, and a terminal-specific or UE-specific search space that a specific UE is required to search. In the common search space, a UE may monitor a PDCCH that all UEs in a cell belonging to the same base station are configured to search in common. In addition, a UE-specific search space may be configured for each UE so that the UE monitors the PDCCH allocated to each UE at different search space positions according to the UE. In the case of a UE-specific search space, the search spaces between UEs may be partially overlapped due to the limited control areas in which the PDCCHs are allocated. Monitoring the PDCCH includes blind decoding to find PDCCH candidates within the search space. When blind decoding is successful, it may be expressed that the PDCCH is (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH is not detected / received or is not successfully detected / received.

[0076] For ease of description, a PDCCH scrambled with a group common (GC) RNTI previously known to one or more UEs to transmit DL control information to one or more UEs is referred to as a group common (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled with a terminal-specific RNTI already known by a specific UE to transmit UL or DL ​​scheduling information to that UE is referred to as a UE-specific PDCCH. A common PDCCH may be included in a common search space, and a UE-specific PDCCH may be included in a common search space or a UE-specific PDCCH.

[0077] A base station may signal information related to resource allocation of the transmission channels paging channel (PCH) and downlink shared channel (DL-SCH) (i.e., DL grants) or information related to resource allocation of the uplink shared channel (UL-SCH) and hybrid automatic repeat request (HARQ) (i.e., UL grants) to each UE or a group of UEs via the PDCCH. The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data excluding specific control information or specific service data via the PDSCH. In addition, a UE may receive data excluding specific control information or specific service data via the PDSCH.

[0078] A base station may transmit a PDCCH to a UE (one or more UEs) including information about where PDSCH data is to be transmitted and how the PDSCH data will be received and decoded by the corresponding UE. For example, assume that the DCI transmitted on a specific PDCCH is CRC masked using an RNTI of "A," and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., a frequency location) of "B," and indicates transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) of "C." The UE monitors the PDCCH using the RNTI information that the UE has. In this case, if a UE performs blind decoding of the PDCCH using the RNTI of "A," the UE receives the PDCCH and, through the received PDCCH information, receives the PDSCH indicated by "B" and "C."

[0079] Table 3 illustrates one embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system.

[0080] [Table 3]

[0081] The PUCCH may be used to transmit the following UL control information (UCI):

[0082] - Scheduling Request (SR): Information used to request UL UL-SCH resources.

[0083] - HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or a response to a DL transport block (TB) on the PDSCH. The HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include a positive ACK (simply ACK), a negative ACK (hereinafter NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK and ACK / NACK. In general, an ACK may be represented by a bit value of 1, and a NACK may be represented by a bit value of 0.

[0084] - Channel State Information (CSI): Feedback information on the DL channel. The UE generates it based on the CSI reference signal (RS) transmitted by the base station. Multiple-input multiple-output (MIMO)-related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI may be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0085] In a 3GPP NR system, five PUCCH formats may be used to support different service scenarios, different channel environments, and frame structures.

[0086] PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted over one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence on the two symbols may be transmitted over different RBs. In this case, the sequence may be a cyclic shift (CS) sequence of a base sequence used for PUCCH format 0. This allows the UE to obtain frequency diversity gain. Specifically, the terminal bit Bit UCI(M bit =1 or 2) to determine the cyclic shift (CS) value m cs Also, the length 12 basic sequence can be determined by the given CS value m cs Based on this, the cyclically shifted sequence can be mapped to 12 REs of one OFDM symbol and one RB and transmitted. bit = 1, one bit UCI 0 and 1 can be mapped to two cyclic shifted sequences, respectively, with a difference in cyclic shift value of 6. bit = 2, the 2-bit UCI 00, 01, 11, 10 can be mapped to four cyclic shifted sequences with a cyclic shift value difference of 3, respectively.

[0087] PUCCH format 1 can deliver 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 can be transmitted over consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 can be one of 4 to 14. More specifically, M bit The UCI for which M = 1 may be BPSK modulated. bitThe UCI, where d(0) = 2, may be modulated using quadrature phase shift keying (QPSK). The signal is obtained by multiplying the modulated complex-valued symbol d(0) by a sequence of length 12. In this case, the sequence may be the base sequence used for PUCCH format 0. The UE spreads the even-numbered OFDM symbols allocated to PUCCH format 1 through a time-domain orthogonal cover code (OCC) to transmit the obtained signal. PUCCH format 1 determines the maximum number of different UEs multiplexed in one RB according to the length of the OCC to be used. A demodulation reference signal (DMRS) may be spread using the OCC and mapped to the odd-numbered OFDM symbols of PUCCH format 1.

[0088] PUCCH format 2 can deliver UCI exceeding two bits. PUCCH format 2 can be transmitted over one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, the sequences transmitted in different RBs over the two OFDM symbols may be identical to each other. Here, the sequence is a sequence of modulated complex-valued symbols d(0),...,d(M symbol -1), where M symbol is M bit / 2. Through this, the UE may obtain frequency diversity gain. More specifically, M bit Bit UCI(M bit >2) is bit-level scrambled, QPSK modulated, and mapped to RBs of one or two OFDM symbols, where the number of RBs may be one of 1 to 16.

[0089] PUCCH format 3 or PUCCH format 4 may deliver UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 may be transmitted over consecutive OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be one of 4 to 14. Specifically, the UE may transmit M-ary PUCCH using π / 2-2 phase shift keying (BPSK) or QPSK. bit Bit UCI(M bit >2) to generate complex-valued symbols d(0) to d(M symb -1) where, when π / 2-BPSK is used, M symb =M bit and when using QPSK, M symb =M bit / 2. The UE does not need to apply block-wise spreading to PUCCH format 3. However, the UE may apply block-wise spreading to one RB (i.e., 12 subcarriers) using PreDFT-OCC of length 12, such that PUCCH format 4 may have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on ​​the spread signal, maps it to each RE, and transmits the spread signal.

[0090] In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of the UCI transmitted by the UE. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together over the PUCCH. When the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some of the UCI information according to the priority of the UCI information.

[0091] PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 may be configured through RRC signaling to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopped may be configured using RRC signaling. When PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 is transmitted over N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceiling(N / 2) OFDM symbols.

[0092] PUCCH Format 1, PUCCH Format 3, or PUCCH Format 4 may be configured to be repeatedly transmitted in multiple slots. In this case, the number K of slots in which the PUCCH is repeatedly transmitted may be configured by RRC signaling. The repeatedly transmitted PUCCH must start at a fixed OFDM symbol in each slot and must have a constant length. When one of the OFDM symbols of a slot in which the UE should transmit the PUCCH is indicated as a DL symbol by RRC signaling, the UE may not transmit the PUCCH in the corresponding slot and may delay transmission of the PUCCH until the next slot for transmitting the PUCCH.

[0093] Meanwhile, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the bandwidth of a carrier (or cell). To this end, the terminal may be configured with a bandwidth part (BWP) consisting of a contiguous portion of the carrier's bandwidth. A terminal operating according to TDD or using an unpaired spectrum may be configured with up to four DL / UL BWP pairs per carrier (or cell). The terminal can also activate one DL / UL BWP pair. A terminal operating according to FDD or using a paired spectrum may be configured with up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per uplink carrier (or cell). The terminal can activate one DL BWP and one UL BWP per carrier (or cell). The terminal does not need to receive or transmit on time-frequency resources other than the activated BWPs. An activated BWP can be referred to as an active BWP.

[0094] A base station can indicate to a terminal which BWPs among configured BWPs are activated using downlink control information (DCI). The BWP indicated in the DCI is activated, and other configured BWPs are deactivated. In a carrier (or cell) operating in TDD, the base station can include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI scheduling a PDSCH or a PUSCH to change the DL / UL BWP pair of the terminal. The terminal can receive the DCI scheduling a PDSCH or a PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH to change the DL BWP of the terminal. In an uplink carrier (or cell) operating in FDD, the base station can include a BPI indicating the activated BWP in the DCI scheduling a PDSCH to change the UL BWP of the terminal.

[0095] FIG. 8 is a conceptual diagram showing carrier aggregation.

[0096] Carrier aggregation is a method in which a UE uses multiple frequency blocks or cells (in a logical sense) configured using UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band so that a wireless communication system can use a wider frequency band. One component carrier may also be referred to as a primary cell (PCell) or a secondary cell (SCell), or a primary SCell (PScell). However, for convenience of explanation, the term "component carrier" will be used hereinafter.

[0097] Referring to Figure 8, as an example of a 3GPP NR system, the overall system band may include up to 16 component carriers, and each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically contiguous subcarriers. Although Figure 8 shows each of the component carriers having the same bandwidth, this is merely an example, and each component carrier may have a different bandwidth. Also, although the component carriers are shown as being adjacent to each other on the frequency axis, the drawing is shown in a logical concept, and the component carriers may be physically adjacent to each other or spaced apart.

[0098] A different center frequency may be used for each component carrier. Also, one common center frequency may be used for physically adjacent component carriers. In the embodiment of Figure 8, assuming that all component carriers are physically adjacent, center frequency A may be used for all component carriers. Furthermore, assuming that the respective component carriers are not physically adjacent to each other, center frequency A and center frequency B may be used for each of the component carriers.

[0099] When the overall system band is expanded by carrier aggregation, the frequency band used for communication with each UE may be specified in component carrier units. UE A may use the overall system band of 100 MHz and perform communication using all five component carriers. UEs B1 to B5 may use only a 20 MHz bandwidth and perform communication using one component carrier. UEs C1 and C2 may use a 40 MHz bandwidth and each perform communication using two component carriers. The two component carriers may or may not be logically / physically adjacent. UE C1 represents a case where two non-adjacent component carriers are used, and UE C2 represents a case where two adjacent component carriers are used.

[0100] 9A and 9B are diagrams for explaining single-carrier communication and multi-carrier communication. Specifically, FIG. 9A shows a single-carrier subframe structure, and FIG. 9B shows a multi-carrier subframe structure.

[0101] Referring to FIG. 9(a), in FDD mode, a typical wireless communication system may transmit or receive data through one DL band and one UL band corresponding thereto. In another specific embodiment, in TDD mode, the wireless communication system may divide a radio frame into UL time units and DL time units in the time domain and transmit or receive data through the UL / DL time units. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) may be aggregated into UL and DL so that a 60 MHz bandwidth can be supported. The CCs may or may not be adjacent to each other in the frequency domain. Although FIG. 9(b) illustrates a case where the bandwidth of the UL CC and the bandwidth of the DL CC are identical and symmetrical, the bandwidth of each CC may be determined independently. In addition, asymmetric carrier aggregation, in which the number of UL CCs and DL CCs differs, is possible. The DL / UL CC allocated / configured to a specific UE through RRC may be referred to as the serving DL / UL CC of the specific UE.

[0102] A base station may communicate with a UE by activating some or all of the UE's serving CCs or deactivating some CCs. The base station can change the CCs to be activated / deactivated and the number of CCs to be activated / deactivated. When a base station allocates CCs available to a UE as cell-specific or UE-specific, at least one of the allocated CCs may be deactivated unless the CC allocation for the UE is completely reconfigured or the UE is handed over. A CC that is not deactivated by the UE is called a Primary CC (PCC) or Primary Cell (PCell), and a CC that the base station can freely activate / deactivate is called a Secondary CC (SCC) or Secondary Cell (SCell).

[0103] On the other hand, 3GPP NR uses the concept that a cell manages radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CC and UL CC. A cell can be configured with only DL resources or a combination of DL resources and UL resources. When carrier aggregation is supported, the association between the carrier frequency of DL resources (i.e., DL CC) and the carrier frequency of UL resources (i.e., UL CC) may be indicated by system information. Carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called an SCell. A carrier corresponding to a PCell in the DL is a DL PCC, and a carrier corresponding to a PCell in the UL is a UL PCC. Similarly, a carrier corresponding to an SCell in the DL is a DL SCC, and a carrier corresponding to an SCell in the UL is a UL SCC. According to UE capabilities, a serving cell can be configured with one PCell and zero or more SCells. For a UE that is in RRC_CONNECTED state but is not configured for or does not support carrier aggregation, there is only one serving cell configured with only a PCell.

[0104] As mentioned above, the term "cell" used in carrier aggregation is distinguished from the term "cell" which refers to several geographical areas for which communication services are provided by one base station or one antenna group. That is, one component carrier may also be referred to as a scheduling cell, scheduled cell, primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, to distinguish between cells which refer to several geographical areas and cells of carrier aggregation, in this disclosure, cells of carrier aggregation are referred to as CCs, and cells of geographical areas are referred to as cells.

[0105] 10 illustrates an example in which a cross-carrier scheduling technique is applied. When cross-carrier scheduling is configured, a control channel transmitted over a first CC may schedule a data channel transmitted over the first CC or a second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is configured, and a DL grant / UL grant transmitted in the PDCCH area of ​​the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists in the PDCCH area of ​​the scheduling cell. A PCell may essentially be the scheduling cell, and a specific SCell may be designated as the scheduling cell by higher layers.

[0106] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured as a PDCCH monitoring CC. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC can transmit only a PDCCH for scheduling its PDSCH without using a CIF according to the NR PDCCH rules (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE group-specific or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., a DL PCC) may transmit not only a PDCCH for scheduling a PDSCH of DL CC A using the CIF, but also a PDCCH for scheduling a PDSCH of another CC (cross-carrier scheduling). On the other hand, the PDCCH is not transmitted in another DL CC. Thus, the UE monitors either the PDCCH without a CIF to receive a self-carrier scheduled PDSCH or the PDCCH with a CIF to receive a cross-carrier scheduled PDSCH, depending on whether cross-carrier scheduling is configured for the UE.

[0107] 9 and 10 show the subframe structure of a 3GPP LTE-A system, and the same or similar configurations may be applied to a 3GPP NR system, except that in a 3GPP NR system, the subframes in FIGS. 9 and 10 may be replaced with slots.

[0108] FIG. 11 is a block diagram illustrating the configuration of a terminal and a base station according to an embodiment of the present disclosure. In the embodiment of the present disclosure, the terminal may be embodied as various wireless communication devices or computer devices that ensure portability and mobility. The terminal may also be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), etc. In addition, in the embodiment of the present disclosure, the base station may control and manage cells (e.g., macrocells, femtocells, picocells, etc.) corresponding to a service area and may have functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station may also be referred to as a next generation Node B (gNB) or an access point (AP), etc.

[0109] As shown, a terminal 100 according to one embodiment of the present disclosure may include a processor 110 , a communication module 120 , a memory 130 , a user interface 140 , and a display unit 150 .

[0110] First, the processor 110 can execute various instructions or programs to process data within the terminal 100. The processor 110 can also control the overall operation of the terminal 100, including each unit, and control data transmission and reception between the units. Here, the processor 110 may be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 110 can receive slot configuration information, determine a slot configuration based on the received information, and perform communication according to the determined slot configuration.

[0111] Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 120 may include multiple network interface cards (NICs) such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either built-in or external. Although the communication module 120 is shown as an integrated module in the figure, each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawing.

[0112] The cellular communication interface card 121 can transmit and receive wireless signals to and from at least one of the base station 200, the external device, and the server using a mobile communication network, and can provide cellular communication services in a first frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 121 can include at least one NIC module using a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 121 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0113] The cellular communication interface card 122 can transmit and receive wireless signals to and from at least one of the base station 200, the external device, and the server using a mobile communication network, and can provide cellular communication services using the second frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 122 can include at least one NIC module using a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 122 can independently perform cellular communication with at least one of the base station 200, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz supported by the NIC module.

[0114] The unlicensed band communication interface card 123 transmits and receives wireless signals to and from at least one of the base station 200, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 110. The unlicensed band communication interface card 123 may include at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 123 can perform wireless communication with at least one of the base station 200, an external device, and a server, independently or dependently, in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0115] Next, the memory 130 stores control programs and various data used by the terminal 100. Such control programs may include predetermined programs required for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

[0116] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. Also, the user interface 140 can perform output based on instructions from the processor 110 using various output means.

[0117] The display unit 150 then outputs various images to a display screen, and can output various display objects, such as content executed by the processor 110 or a user interface based on control instructions of the processor 110.

[0118] Furthermore, the base station 200 according to an embodiment of the present disclosure may include a processor 210, a communication module 220, and a memory 230.

[0119] First, the processor 210 can execute various instructions or programs to process data within the base station 200. The processor 210 can also control the overall operation of each unit of the base station 200 and control data transmission and reception between the units. Here, the processor 210 may be configured to perform operations according to the embodiments described in this disclosure. For example, the processor 210 can signal slot configuration information and perform communication according to the signaled slot configuration.

[0120] Next, the communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 220 may include multiple network interface cards, such as cellular communication interface cards 221 and 222 and an unlicensed band communication interface card 223, in an internal or external form. Although the communication module 220 is shown as an integrated module in the drawing, each network interface card may be independently arranged depending on the circuit configuration or application, unlike the drawing.

[0121] The cellular communication interface card 221 can transmit and receive wireless signals to and from at least one of the terminal 100, the external device, and the server using a mobile communication network, and can provide cellular communication services using the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 can include at least one NIC module using a frequency band below 6 GHz. The at least one NIC module of the cellular communication interface card 221 can independently perform cellular communication with at least one of the terminal 100, the external device, and the server in accordance with a cellular communication standard or protocol for the frequency band below 6 GHz supported by the NIC module.

[0122] The cellular communication interface card 222 can transmit and receive wireless signals to and from at least one of the terminal 100, an external device, and a server using a mobile communication network, and can provide cellular communication services using the second frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 222 can include at least one NIC module using a frequency band above 6 GHz. The at least one NIC module of the cellular communication interface card 222 can independently perform cellular communication with at least one of the terminal 100, an external device, and a server in accordance with a cellular communication standard or protocol for the frequency band above 6 GHz supported by the NIC module.

[0123] The unlicensed band communication interface card 223 transmits and receives wireless signals to and from at least one of the terminal 100, an external device, and a server using a third frequency band, which is an unlicensed band, and provides unlicensed band communication services based on instructions from the processor 210. The unlicensed band communication interface card 223 may include at least one NIC module that uses the unlicensed band. For example, the unlicensed band may be the 2.4 GHz or 5 GHz band. The at least one NIC module of the unlicensed band communication interface card 223 can perform wireless communication with at least one of the terminal 100, an external device, and a server, independently or dependently, in accordance with the unlicensed band communication standard or protocol of the frequency band supported by the NIC module.

[0124] The terminal 100 and base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present disclosure, and the separated blocks indicate logically distinct device elements. Therefore, the above-described device elements may be implemented as a single chip or multiple chips depending on the device design. In addition, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be selectively provided in the terminal 100. In addition, the user interface 140 and the display unit 150 may be further provided in the base station 200 as needed.

[0125] When a PUSCH transmission and a PUCCH transmission including UCI overlap in any one slot, the terminal may transmit the PUSCH together with uplink control information (UCI). Specifically, the terminal may multiplex the UCI into the PUSCH transmission. In a specific embodiment, the terminal may multiplex hybrid automatic repeat request (HARQ)-ACK information into the PUSCH transmission. In this case, the terminal may multiplex the HARQ-ACK information into the PUSCH transmission based on the value of a downlink assignment index (UL-DAI) field. In this specification, HARQ-ACK information is information indicating whether the PDSCH has been successfully received. Specifically, the HARQ-ACK information includes one or more bits indicating whether the PDSCH has been successfully received, and each bit may indicate ACK or NACK.

[0126] A Downlink Assignment Index (DAI) indicates information regarding the number of HARQ-ACKs included in a hybrid automatic repeat request (HARQ)-ACK codebook, which indicates whether a terminal has successfully received multiple PDSCHs to a base station. The terminal can receive the DAI via a PDCCH that schedules a PDSCH. Specifically, the DAI can be divided into a counter-DAI and a total-DAI. The total-DAI indicates the number of PDSCHs transmitted using the same HARQ-ACK codebook. The counter-DAI indicates the ordinal number of a PDSCH indicated by the same total-DAI. The DCI that schedules a PDSCH may include a counter-DAI value corresponding to the scheduled PDSCH. Furthermore, the DCI that schedules a PDSCH may include a total-DAI value corresponding to the scheduled PDSCH.

[0127] When a dynamic HARQ-ACK codebook is configured in the UE, the DCI scheduling the PUSCH may include a 2-bit or 4-bit UL-DAI field. In this specification, the UL-DAI field refers to the DAI field of the DCI scheduling the PUSCH transmission. When transport block group (TBG)-based transmission is configured, the DCI scheduling the PUSCH may include a 2-bit UL-DAI field. In the following description, unless otherwise specified, the UL-DAI field refers to the UL-DAI field of the DCI scheduling the PUSCH. When code block group (CBG)-based transmission is configured, the DCI scheduling the PUSCH may include a 4-bit UL-DAI field. The value of the 2-bit UL-DAI field may indicate the remainder when the number of PDSCHs for which successful reception is indicated by HARQ-ACK information multiplexed into the PUSCH transmission is divided by 4. In a specific embodiment, the value of the 2-bit UL-DAI field is 0 (i.e., 00 b ), the value of the 2-bit UL-DAI field may indicate that the remainder when the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission is divided by 4 is 1 (for example, the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information is 1, 5, 9, ...). Also, in a specific embodiment, the value of the 2-bit UL-DAI field may indicate that the value of 1 (i.e., 01 b ), the value of the 2-bit UL-DAI field may indicate that the remainder when the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission is divided by 4 is 2 (for example, the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information may be 2, 6, 10, ...). Also, in a specific embodiment, the value of the 2-bit UL-DAI field may indicate that the remainder when the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information is 2 (for example, 10, 2, 6, 10, ...). b), the value of the 2-bit UL-DAI field can indicate that the remainder when the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission is divided by 4 is 3 (for example, the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information is 3, 7, 11, ...). b ), the value of the 2-bit UL-DAI field can indicate that the remainder when the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission is divided by 4 is 0 (for example, the number of PDSCHs for which successful reception is indicated by the HARQ-ACK information can be 0, 4, 8, ...).

[0128] If there is no HARQ-ACK information to be transmitted by the UE in a slot where PUSCH transmission is performed, the UE may not multiplex the HARQ-ACK information into the PUSCH transmission according to the value of the UL-DAI field. For example, if a dynamic HARQ-ACK codebook is configured in the UE and the value of the UL-DAI field is 3 (i.e., 11 b), and if there is no HARQ-ACK information transmitted by the UE in a slot in which PUSCH transmission is performed, the UE does not need to multiplex HARQ-ACK information into PUSCH transmission. If the UE does not receive any PDSCH scheduling TB-based transmission in a slot in which PUSCH transmission is performed, it can determine that there is no HARQ-ACK information for the TB-based transmission transmitted by the UE in a slot in which PUSCH transmission is performed. The 2-bit total-DAI for CBG-based transmission may be a specific value, and the UE may not receive any PDSCH scheduling CBG-based transmission in a slot in which PUSCH transmission is performed. In this case, the UE can determine that there is no HARQ-ACK information for the CBG-based transmission transmitted by the UE in a slot in which PUSCH transmission is performed. If the terminal determines that there is no HARQ-ACK information for the TB-based transmission and no HARQ-ACK information for the CBG-based transmission transmitted by the terminal in the slot in which the PUSCH transmission is performed, the terminal may not multiplex the HARQ-ACK information into the PUSCH transmission even if the PUSCH transmission and the PUCCH transmission including the HARQ-ACK information overlap. b ), and if the terminal does not receive any DCI scheduling a PDSCH corresponding to a HARQ-ACK included in a PUCCH transmission that overlaps in the time domain with a PUSCH transmission, the terminal does not need to multiplex HARQ-ACK information into the PUSCH transmission.

[0129] Furthermore, when the UE multiplexes HARQ-ACK information into a PUSCH transmission, the UE can determine whether to multiplex HARQ-ACK information into the PUSCH transmission based on the value of the UL (uplink)-DAI field of the DCI scheduling the PUSCH. Specifically, when a semi-static HARQ-ACK codebook is configured in the UE, the DCI scheduling the PUSCH may include a 1-bit UL-DAI field. In this case, the value of the 1-bit UL-DAI field may indicate whether HARQ-ACK information is multiplexed into the PUSCH transmission. If the value of the 1-bit UL-DAI field is 0, the UE may not multiplex HARQ-ACK information into the PUSCH transmission scheduled by the DCI. If the value of the 1-bit UL-DAI field is 1, the UE may multiplex HARQ-ACK information into the PUSCH transmission scheduled by the DCI. In such an embodiment, the number of bits of the HARQ-ACK information is determined by a method predetermined between the terminal and the base station.

[0130] The UE can transmit the PUSCH over multiple slots. Specifically, the UE can repeatedly transmit the PUSCH over multiple slots. In this case, the UE can transmit the PUSCH over two, four, or eight slots. Repeated transmission of the PUSCH by the UE over multiple slots can be referred to as slot aggregation. In this specification, repeated transmission of the PUSCH can refer to transmitting a PUSCH including multiple identical TBs or repeatedly transmitting a PUSCH including one TB. For convenience of explanation, a unit of repetition including the same TB in a PUSCH is referred to as a repetition unit. The base station can indicate to the UE information indicating the time domain of the initial PUSCH transmission or the transmission of a repetition unit included in the PUSCH transmission and the number of repetitions. The UE can repeatedly transmit the PUSCH based on the information indicating the time domain of the initial PUSCH transmission or the repetition unit and the number of repetitions. In another specific embodiment, the base station can indicate time-frequency allocation information for each PUSCH transmission or repetition unit to the UE. The terminal may repeatedly transmit the PUSCH according to the indicated time-frequency resource allocation information. If the terminal transmits the PUSCH over multiple slots and the PUSCH transmission overlaps with a PUCCH transmission including UCI (e.g., HARQ-ACK information) in the slot in which the PUSCH is transmitted, the terminal may multiplex the UCI into the PUSCH transmission and transmit the PUSCH.

[0131] When a UE transmits a PUSCH over multiple slots, a problem may arise as to how the UE multiplexes UCI into the PUSCH transmission. For example, a problem may arise as to how the UE determines whether to multiplex HARQ-ACK information into the PUSCH transmission in each of multiple slots in which the PUSCH is transmitted. Furthermore, when the UE multiplexes HARQ-ACK information into the PUSCH transmission, a problem may arise as to how the UE applies the value of the UL-DAI field to each of multiple slots. Specifically, when the UE multiplexes HARQ-ACK information into the PUSCH transmission, a problem may arise as to how the UE determines the number of bits of HARQ-ACK information for each of multiple slots. Furthermore, when the UE repeats PUSCH transmission within one slot, a problem may arise as to how the UE multiplexes HARQ-ACK information into the PUSCH transmission. For example, a problem may arise as to how the UE determines whether to multiplex HARQ-ACK information into the PUSCH transmission for each of multiple units. Furthermore, when a terminal multiplexes HARQ-ACK information into PUSCH transmission, a problem may arise as to how the terminal applies the value of the UL-DAI field to each of multiple repetition units. Specifically, when a terminal multiplexes HARQ-ACK information into PUSCH transmission, a problem may arise as to how the terminal determines the number of bits of HARQ-ACK information for each of multiple repetition units. A specific method for multiplexing HARQ-ACK information into PUSCH transmission will be described with reference to FIGS. 12 to 18. Furthermore, in this specification, multiplexing may refer to piggybacking. Piggybacking and multiplexing can be used interchangeably.

[0132] FIG. 12 illustrates an operation of a terminal according to an embodiment of the present invention multiplexing HARQ-ACK information into PUSCH transmissions on multiple slots.

[0133] The UE may not multiplex HARQ-ACK information into PUSCH transmission in a slot where the UE would not transmit HARQ-ACK information together with the PUCCH if PUSCH transmission is absent. Specifically, the UE may determine whether to multiplex HARQ-ACK into PUSCH transmission for each of multiple slots in which PUSCH transmission is performed. In this case, if the UE does not receive a PDCCH or PDSCH corresponding to HARQ-ACK information to be transmitted in a specific slot, the UE may not multiplex HARQ-ACK information into PUSCH transmission in the slot. The PDCCH corresponding to HARQ-ACK information to be transmitted in the slot may be a PDCCH including DCI for scheduling a PUCCH including HARQ-ACK information to be transmitted in the slot. However, if PDSCH transmission does not need to be scheduled via a PDCCH, such as an SPS PDSCH, the UE may not determine whether a PDCCH corresponding to HARQ-ACK information is received. PDSCH transmission does not need to be scheduled via a PDCCH, and even if the terminal fails to receive a PDCCH corresponding to HARQ-ACK information, the terminal can receive a PDSCH corresponding to the HARQ-ACK information. In this case, the terminal can multiplex the HARQ-ACK information into a PUSCH transmission. In addition, the PDSCH corresponding to the HARQ-ACK information to be transmitted in the corresponding slot may be a PDSCH indicating whether the HARQ-ACK to be transmitted in the corresponding slot is successfully received. The PDCCH or PDSCH corresponding to the HARQ-ACK information to be transmitted in the corresponding slot may be a PDCCH or PDSCH that satisfies the HARQ-ACK timing for the corresponding slot. The HARQ-ACK timing is indicated by the DCI that schedules the PDSCH and indicates the number of slots between the slot including the last symbol of the corresponding PDSCH and the slot including the PUCCH that transmits the HARQ-ACK.In the above embodiment, the UE multiplexes HARQ-ACK information onto PUSCH transmission in one of a plurality of slots in which PUSCH transmission is performed, and if the UE does not receive a PDCCH corresponding to HARQ-ACK information to be transmitted in another slot, the UE may not multiplex HARQ-ACK information onto PUSCH transmission in the other slot. The number of bits of HARQ-ACK information multiplexed onto PUSCH transmission in each slot may be determined by the value of the UL-DAI field of the PDCCH that schedules the PUSCH transmission.

[0134] In the embodiment of Figure 12, PUSCH transmission is performed from the first slot (slot n) to the fourth slot (slot n+3). The terminal multiplexes HARQ-ACK information into PUSCH transmission in each of the first slot (slot n) and the second slot (slot n+1). In this case, in the first slot (slot n), PUSCH transmission overlaps with a first PUCCH (PUCCH1) transmission including HARQ-ACK information indicating whether each of the first PDSCH (PDSCH1), the second PDSCH (PDSCH2), and the third PDSCH (PDSCH3) has been successfully received. In addition, in the second slot (slot n+1), PUSCH transmission overlaps with a second PUCCH (PUCCH2) transmission including HARQ-ACK information indicating whether the fourth PDSCH (PDSCH4) has been successfully received. The UE multiplexes HARQ-ACK information indicating whether the first PDSCH (PDSCH1), second PDSCH (PDSCH2), and third PDSCH (PDSCH3) are successfully received in the first slot (slot n) into the PUSCH transmission. The UE also multiplexes HARQ-ACK information indicating whether the fourth PDSCH (PDSCH4) is successfully received in the second slot (slot n+1) into the PUSCH transmission. The UE cannot receive the PDCCH or PDSCH corresponding to the HARQ-ACK information to be transmitted in the third slot (slot n+2) and the fourth slot (slot n+3), respectively. Therefore, the UE does not multiplex HARQ-ACK information into the PUSCH transmission in the third slot (slot n+2) and the fourth slot (slot n+3).

[0135] When the PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied based on a repetition unit rather than a slot. The UE may not multiplex HARQ-ACK information into PUSCH transmission in a repetition unit in which the UE would not transmit HARQ-ACK information together with the PUCCH if the PUSCH transmission is absent. Specifically, the UE may determine whether to multiplex HARQ-ACK into PUSCH transmission for each of a plurality of repetition units. In this case, if the UE does not receive a PDCCH corresponding to HARQ-ACK information to be transmitted in a specific repetition unit, the UE may not multiplex HARQ-ACK information into PUSCH transmission for the corresponding repetition unit. In the above-described embodiment, the UE multiplexes HARQ-ACK information into PUSCH transmission in one of a plurality of repetition units. If the UE does not receive a PDCCH or PDSCH corresponding to HARQ-ACK information to be transmitted in another repetition unit, the UE may not multiplex HARQ-ACK information into PUSCH transmission for the other repetition unit. The number of bits of HARQ-ACK information multiplexed into a PUSCH transmission in each repetition unit may be determined by the value of the UL-DAI field of the PDCCH that schedules the PUSCH transmission.

[0136] FIG. 13 illustrates an operation of a terminal according to another embodiment of the present invention, in which the terminal multiplexes HARQ-ACK information into PUSCH transmissions on multiple slots.

[0137] In another specific embodiment, the terminal may determine whether to multiplex HARQ-ACK information onto PUSCH transmissions across multiple slots in which PUSCH transmissions are performed. Specifically, the terminal may determine whether to multiplex HARQ-ACK information onto PUSCH transmissions across multiple slots in which PUSCH transmissions are performed, or whether to not multiplex HARQ-ACK information onto PUSCH transmissions across multiple slots in which PUSCH transmissions are performed. When a semi-static HARQ-ACK codebook is configured and the UL-DAI field has a value of 1, the terminal may multiplex HARQ-ACK onto PUSCH transmissions across multiple slots in which PUSCH transmissions are performed. Also, when a semi-static HARQ-ACK codebook is configured and the UL-DAI field has a value of 0, the terminal may not multiplex HARQ-ACK onto PUSCH transmissions across multiple slots in which PUSCH transmissions are performed. In this embodiment, each piece of HARQ-ACK information multiplexed into a PUSCH transmission in each slot may indicate whether different PDSCHs have been successfully received. When configured using a semi-static HARQ-ACK codebook, an aggregation of PDSCHs corresponding to HARQ-ACKs transmitted in one slot is defined, and the aggregations of PDSCHs corresponding to HARQ-ACKs transmitted in different slots may include the same PDSCH. Specifically, PDSCH aggregations (referred to as DL association sets) indicating whether each piece of HARQ-ACK information multiplexed into a PUSCH transmission in each slot has been successfully received may be determined to be disjoint. Here, determining the aggregations of PDSCHs to be disjoint means that the first aggregation of PDSCHs transmitted in one slot with HARQ-ACK and the second aggregation of PDSCHs transmitted in another slot with HARQ-ACK do not include the same PDSCH.For example, the HARQ-ACK information multiplexed in the subsequent slot does not need to indicate the success or failure of reception for the PDSCH whose reception was indicated by the HARQ-ACK information multiplexed in the PUSCH transmission in the previous slot. In this case, the HARQ-ACK information multiplexed in the previous slot is not redundantly multiplexed in the PUSCH transmission of the subsequent slot, thereby reducing UCI overhead on the PUSCH.

[0138] In the embodiment of Figure 13, PUSCH transmission is performed from the first slot (slot n) to the second slot (slot n+1). In the first slot (slot n) and the second slot (slot n+1), PUSCH transmission overlaps with PUCCH transmission along with HARQ-ACK information. The DL association set of the first PUCCH (PUCCH1) transmission overlapping with the PUSCH transmission in the first slot (slot n) is the first PDSCH (PDSCH1) to the third PDSCH (PDSCH3). In this case, the DL association set is an aggregation of PDSCHs, where the HARQ-ACK information included in the PUCCH indicates whether reception is successful or not. The DL association set for the second PUCCH (PUCCH2) transmission overlapping with the PUSCH transmission in the second slot (slot n+1) is the second PDSCH (PDSCH2) through the fourth PDSCH (PDSCH4). The terminal multiplexes HARQ-ACK information indicating whether each of the first PDSCH (PDSCH1), the second PDSCH (PDSCH2), and the third PDSCH (PDSCH3) was successfully received into the PUSCH transmission in the first slot (slot n). Furthermore, the terminal multiplexes HARQ-ACK information indicating whether the fourth PDSCH (PDSCH3) was successfully received into the PUSCH transmission in the second slot (slot n+1). This is because the HARQ-ACK information indicating whether the second PDSCH (PDSCH2) and the third PDSCH (PDSCH3) were successfully received was multiplexed into the PUSCH transmission in the first slot (slot n).

[0139] When the PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied on a repetition unit basis rather than a slot basis. The terminal may determine whether to multiplex HARQ-ACK information onto PUSCH transmission across multiple repetition units. Specifically, the terminal may decide to multiplex HARQ-ACK information onto PUSCH transmission across all multiple repetition units, or not to multiplex HARQ-ACK information onto PUSCH transmission across all multiple repetition units. When a semi-static HARQ-ACK codebook is configured and the UL-DAI field has a value of 1, the terminal may multiplex HARQ-ACK onto PUSCH transmission across all multiple repetition units. Also, when a semi-static HARQ-ACK codebook is configured and the UL-DAI field has a value of 0, the terminal may not multiplex HARQ-ACK onto PUSCH transmission across all multiple repetition units. In this embodiment, each HARQ-ACK information multiplexed into a PUSCH transmission in each slot may indicate whether different PDSCHs have been successfully received. When configured using a semi-static HARQ-ACK codebook, an aggregation of PDSCHs corresponding to HARQ-ACKs transmitted in one slot is defined, and the same PDSCH may be included in the aggregations of PDSCHs corresponding to HARQ-ACKs transmitted in different slots. Specifically, the aggregations of PDSCHs indicating whether each piece of HARQ-ACK information multiplexed into a PUSCH transmission in each repetition unit has been successfully received may be determined to be disjoint from each other. Here, determining the aggregations of PDSCHs to be disjoint from each other means that the first aggregation of PDSCHs transmitted in one slot with HARQ-ACK and the second aggregation of PDSCHs transmitted in another slot with HARQ-ACK do not include the same PDSCH.For example, the HARQ-ACK information multiplexed in the subsequent repetition unit does not need to indicate the success or failure of reception for the PDSCH whose reception success or failure was indicated by the HARQ-ACK information multiplexed into the PUSCH transmission in the previous repetition unit.

[0140] 14 and 15 illustrate an operation of a terminal according to yet another embodiment of the present invention in which HARQ-ACK information is multiplexed into PUSCH transmissions on multiple slots.

[0141] In yet another specific embodiment, when a PUCCH transmission with HARQ-ACK information overlaps with at least one slot of a plurality of slots in which a PUSCH transmission is performed, the terminal may aggregate HARQ-ACK information of all PUCCH transmissions overlapping with the PUSCH transmission. In this case, the terminal may multiplex the HARQ-ACK information aggregated in one of the plurality of slots in which a PUSCH transmission is performed into the PUSCH transmission. Specifically, when the value of the UL-DAI field scheduling the PUSCH transmission is 1, the terminal may aggregate HARQ-ACK information of all PUCCH transmissions overlapping with the PUSCH transmission and multiplex the HARQ-ACK information aggregated in one of the plurality of slots in which a PUSCH transmission is performed into the PUSCH transmission. In the above embodiment, the one slot may be the last slot of the slots in which a PUSCH transmission is performed. In yet another embodiment, the one slot may be the last slot among slots in which PUSCH transmission and PUCCH transmission with HARQ-ACK information overlap, or the one slot may be the first slot among slots in which PUSCH transmission is performed, or in yet another embodiment, the one slot may be the first slot among slots in which PUSCH transmission and PUCCH transmission with HARQ-ACK information overlap.

[0142] In the embodiment of Figure 14, PUSCH transmission is performed from the first slot (slot n) to the second slot (slot n+1). In the first slot (slot n) and the second slot (slot n+1), PUSCH transmission is overlapped with PUCCH transmission along with HARQ-ACK information. The DL association set of the first PUCCH (PUCCH1) transmission overlapping with the PUSCH transmission in the first slot (slot n) is the first PDSCH (PDSCH1) to the third PDSCH (PDSCH3). The DL association set of the second PUCCH (PUCCH2) transmission overlapping with the PUSCH transmission in the second slot (slot n+1) is the second PDSCH (PDSCH2) to the fourth PDSCH (PDSCH4). In the second slot (slot n+1), the terminal multiplexes HARQ-ACK information, which indicates whether each of the first PDSCH (PDSCH1), the second PDSCH (PDSCH2), the third PDSCH (PDSCH3), and the fourth PDSCH (PDSCH4) was successfully received, into the PUSCH transmission.

[0143] In the embodiment of FIG. 15, PUSCH transmission is performed from the first slot (slot n) to the fourth slot (slot n+3). Specifically, PUSCH transmission is repeated for every slot from the first slot (slot n) to the fourth slot (slot n+3). In the first slot (slot n) and the third slot (slot n+2), PUSCH transmission overlaps with PUCCH transmission along with HARQ-ACK information. The terminal aggregates PDSCHs corresponding to the HARQ-ACK information transmitted along with the PUCCH transmitted in the first slot (slot n) and the HARQ-ACK information transmitted along with the PUCCH transmitted in the third slot (slot n+2). The terminal multiplexes the HARQ-ACK information of the aggregated PDSCH into PUSCH transmission in the third slot (slot n+2), which is the last slot among the slots where PUSCH transmission and PUCCH transmission along with HARQ-ACK information overlap.

[0144] When PUSCHs are repeatedly transmitted within one slot, the above-described embodiments may be applied based on repetition units rather than slots. When PUCCH transmissions with HARQ-ACK information overlap in one of a plurality of repetition units, the terminal may aggregate PDSCHs containing HARQ-ACK information for all PUCCH transmissions overlapping with the PUSCH transmission. In this case, the terminal may multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission in one of a plurality of repetition units. Specifically, when the value of the UL-DAI field scheduling the PUSCH transmission is 1, the terminal may aggregate PDSCHs corresponding to the HARQ-ACK information of all PUCCH transmissions overlapping with the PUSCH transmission, and multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission in one of a plurality of repetition units. In the above-described embodiments, one of the repetition units may be the last repetition unit of the plurality of repetition units. In yet another embodiment, any one repeat unit may be the last repeat unit of the plurality of repeat units, and any one repeat unit in any one slot may be the first repeat unit of the plurality of repeat units, and in yet another embodiment, any one repeat unit in any one slot may be the first repeat unit of the plurality of repeat units.

[0145] In another specific embodiment, the UE may aggregate PDSCHs corresponding to HARQ-ACK information of all PUCCH transmissions overlapping with PUSCH transmissions, and repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission for each slot among a plurality of slots in which PUSCH transmissions are performed. Specifically, the UE may repeatedly transmit the HARQ-ACK information of the aggregated PDSCHs for each slot among all slots in which PUSCH transmissions are performed. In another specific embodiment, the UE may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission for each slot in which PUCCH transmissions with HARQ-ACK information overlap among a plurality of slots in which PUSCH transmissions are performed. In another specific embodiment, the UE may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for every slot from the first slot where the PUCCH transmission with HARQ-ACK information overlaps to the last slot where the PUCCH transmission with HARQ-ACK information overlaps among a plurality of slots where PUSCH transmission is performed. In another specific embodiment, the UE may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for every slot from the first slot where the PUCCH transmission with HARQ-ACK information overlaps to the last slot where the PUSCH transmission is performed among a plurality of slots where PUSCH transmission is performed. In another specific embodiment, the UE may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for every slot from the last slot where the PUCCH transmission with HARQ-ACK information overlaps to the last slot where the PUSCH transmission is performed among a plurality of slots where PUSCH transmission is performed.

[0146] When the PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied on a repetition unit basis rather than a slot basis. The terminal may aggregate PDSCHs corresponding to HARQ-ACK information of all PUCCH transmissions overlapping with the PUSCH transmission, and repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission for each repetition unit in a plurality of repetition units. Specifically, the terminal may repeatedly transmit the HARQ-ACK information of the aggregated PDSCHs for each repetition unit in which PUSCH transmission is performed. In another specific embodiment, the terminal may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs into the PUSCH transmission for each repetition unit in which PUCCH transmissions with HARQ-ACK information overlap among the plurality of repetition units. In another specific embodiment, the terminal may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for each repetition unit from the first repetition unit in which the PUCCH transmission with HARQ-ACK information overlaps to the last repetition unit in which the PUCCH transmission with HARQ-ACK information overlaps among the plurality of repetition units. In another specific embodiment, the terminal may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for each repetition unit from the first repetition unit in which the PUCCH transmission with HARQ-ACK information overlaps to the last repetition unit in which the PUSCH transmission is performed among the plurality of repetition units. In another specific embodiment, the terminal may repeatedly multiplex the HARQ-ACK information of the aggregated PDSCHs onto the PUSCH transmission for each repetition unit from the last repetition unit in which the PUCCH transmission with HARQ-ACK information overlaps to the last repetition unit in which the PUSCH transmission is performed among the plurality of repetition units.

[0147] When a base station schedules PUSCH transmissions on multiple slots, the base station may schedule the PUSCH transmissions or PUCCH transmissions such that the number of slots in which the corresponding PUSCH transmissions and PUCCH transmissions overlap is equal to or less than a certain number. When PUSCH transmissions are performed on multiple slots, the UE may assume that the corresponding PUSCH transmissions and PUCCH transmissions may overlap in a certain number of slots or less. That is, when PUSCH transmissions are performed on multiple slots, the UE may assume that the corresponding PUSCH transmissions and PUCCH transmissions may not overlap in more than a certain number of slots. In this case, the certain number may be 1. Specifically, when PUSCH transmissions are performed on multiple slots, the UE may expect that the number of slots in which the PUSCH transmissions and PUCCH transmissions overlap is at most 1. When a semi-static HARQ-ACK codebook is configured, the UE may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH indicates whether a PDSCH corresponding to one PUCCH transmission exists. In this embodiment, the slot in which the PUSCH transmission and the PUCCH transmission overlap may be the last slot among the slots in which the PUSCH transmission is performed. In another specific embodiment, the slot in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the earliest (first) slot among the slots in which the PUSCH transmission is performed. In another specific embodiment, the slot in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the first slot among the slots in which the PUSCH transmission and the PUCCH transmission overlap. In another specific embodiment, the slot in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the last slot among the slots in which the PUSCH transmission and the PUCCH transmission overlap.

[0148] When a PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied based on a repetition unit rather than a slot. The base station may schedule PUSCH transmission or PUCCH transmission so that the number of repetition units in which the corresponding PUSCH transmission and PUCCH transmission overlap is equal to or less than a certain number. When PUSCH transmission is performed over multiple repetition units, the terminal may assume that the corresponding PUSCH transmission and PUCCH transmission may overlap over a certain number of repetition units or less. That is, when PUSCH transmission is performed over multiple repetition units, the terminal may assume that the corresponding PUSCH transmission and PUCCH transmission may not overlap over more than a certain number of repetition units. In this case, the certain number may be 1. Specifically, when PUSCH transmission is performed over multiple repetition units, the terminal may expect that the number of repetition units in which the PUSCH transmission and PUCCH transmission overlap is at most 1. When a semi-static HARQ-ACK codebook is configured, the terminal may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH indicates multiplexing of PUCCH transmission with one HARQ-ACK. In this embodiment, the repetition unit in which the PUSCH transmission and the PUCCH transmission overlap may be the last repetition unit among the repetition units in which the PUSCH transmission is performed. In another specific embodiment, the repetition unit in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the earliest (first) repetition unit among the repetition units in which the PUSCH transmission is performed. In another specific embodiment, the repetition unit in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the first repetition unit among the repetition units in which the PUSCH transmission and the PUCCH transmission overlap. In another specific embodiment, the repetition unit in which the PUSCH transmission and the PUCCH transmission with HARQ-ACK overlap may be the last repetition unit among the repetition units in which the PUSCH transmission and the PUCCH transmission overlap.

[0149] When PUSCH transmission is performed in multiple slots, the PUSCH transmission may be performed in multiple discontinuous slots. This is because PUSCH transmission can only be performed in symbols set as flexible symbols or UL symbols via RRC signaling. Specifically, the UE can transmit PUSCH in symbols set as DL symbols via RRC signaling. Therefore, if any of the symbols scheduled for PUSCH in a specific slot is set as DL symbols via RRC signaling, the UE cannot transmit PUSCH in the corresponding slot. The RRC signal that sets which symbol is an UL symbol, flexible symbol, or DL ​​symbol may be at least one of tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated. When PUSCH transmission is performed in multiple discontinuous slots, the maximum number of slots in which PUSCH transmission and PUCCH transmission overlap may be determined based on the number of consecutive slots. Specifically, consecutive slots among the slots in which PUSCH transmission and PUCCH transmission overlap are counted as one. If the slots are not consecutive, they are counted as another consecutive slot. A slot chunk represents a set of consecutive slots in which PUSCH transmission is performed. For example, PUSCH transmission is performed in the first slot (slot n), the second slot (slot n+1), and the fourth slot (slot n+3), and the third slot (slot n+2) overlaps with one or more DL symbols and therefore PUSCH transmission is not possible. In this case, the number of slot chunks is two. In this case, the UE aggregates PDSCHs corresponding to HARQ-ACK information with PUCCH transmissions overlapped with PUSCH transmissions, and can multiplex the HARQ-ACK information of the aggregated PDSCHs into PUSCH transmissions in the last slot chunk.

[0150] According to the above embodiment, when the UE multiplexes HARQ-ACK information into PUSCH transmissions on multiple slots, a method for the UE to apply the value of the UL-DAI field to multiplexing of HARQ-ACK information will be described. For each slot in which HARQ-ACK information is multiplexed into a PUSCH transmission, the UE can determine whether to multiplex HARQ-ACK information into the PUSCH transmission by applying the value of the UL-DAI field of the DCI scheduling the corresponding PUSCH transmission. Specifically, for each slot in which HARQ-ACK information is multiplexed into a PUSCH transmission, the UE can determine whether to multiplex HARQ-ACK information and the number of bits of HARQ-ACK information according to the value of the UL-DAI field. For example, if PUSCH transmission is performed using four slots, the UE can determine whether to multiplex HARQ-ACK information into PUSCH transmissions using four slots. In this case, the terminal can determine whether to multiplex HARQ-ACK information into each of the four slots and the number of bits of the HARQ-ACK information to be multiplexed, based on the value of the UL-DAI field. The number of PDSCHs indicating whether the HARQ-ACK information multiplexed into the PUSCH transmission in the first slot is N1, the number of PDSCHs indicating whether the HARQ-ACK information multiplexed into the PUSCH transmission in the second slot is N2, the number of PDSCHs indicating whether the HARQ-ACK information multiplexed into the PUSCH transmission in the third slot is N3, and the number of PDSCHs indicating whether the HARQ-ACK information multiplexed into the PUSCH transmission in the fourth slot is N4. In this case, the terminal can assume that the remainder when N1, N2, N3, and N4 are each divided by 4 is the value indicated by the value of the UL-DAI field. For example, if the value of the UL-DAI field is 0 (00 b) is indicated, the terminal can determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed in each of the first slot, second slot, third slot, and fourth slot is divided by 4 is 1 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 1, 5, 9, ...). The terminal can determine that the value of the UL-DAI field is 1 (01 b ), the terminal can determine that the remainder when dividing the number of PDSCHs corresponding to HARQ-ACKs multiplexed in each of the first, second, third, and fourth slots by 4 is 2 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 2, 6, 10, ...). When the value of the UL-DAI field is 2 (10 b ), the UE can determine that the remainder when dividing the number of PDSCHs corresponding to HARQ-ACKs multiplexed in the first, second, third, and fourth slots by 4 is 3 (i.e., any one of 3, 7, 11, ...). b), the UE can determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed into each of the first, second, third, and fourth slots is divided by 4 is 0 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 0, 4, 8, ...). The number of PDSCHs corresponding to HARQ-ACKs multiplexed into each slot may be different. Also, as in the embodiment described in FIG. 13, the UE can determine whether to multiplex HARQ-ACK information into PUSCH transmission across multiple slots in which PUSCH transmission is performed. In this case, the UE can multiplex HARQ-ACK information into PUSCH transmission by applying the value of the UL-DAI field to each slot in which HARQ-ACK information is multiplexed into PUSCH transmission. Specifically, even if there is no PDSCH corresponding to HARQ-ACK information for PUCCH transmission in a specific slot, the UE can multiplex HARQ-ACK information into PUSCH transmission in the corresponding slot.

[0151] When the PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied based on a repetition unit rather than a slot. The UE may determine whether to multiplex HARQ-ACK information into PUSCH transmission for each repetition unit in which HARQ-ACK information is multiplexed into PUSCH transmission by applying the value of the UL-DAI field of the DCI scheduling the corresponding PUSCH transmission. Specifically, the UE may determine whether to multiplex HARQ-ACK information and the number of bits of HARQ-ACK information according to the value of the UL-DAI field for each repetition unit in which HARQ-ACK information is multiplexed into PUSCH transmission. For example, if PUSCH transmission is performed in four repetition units, the UE may determine whether to multiplex HARQ-ACK information into PUSCH transmission for each of the four repetition units. In this case, the UE may determine whether to multiplex HARQ-ACK information for each of the four repetition units and the number of bits of HARQ-ACK information to be multiplexed based on the value of the UL-DAI field. The number of PDSCHs indicating whether the HARQ-ACK information is received or not, which are multiplexed into the PUSCH transmission in the first repetition unit, is defined as N1; the number of PDSCHs indicating whether the HARQ-ACK information is received or not, which are multiplexed into the PUSCH transmission in the second repetition unit, is defined as N2; the number of PDSCHs indicating whether the HARQ-ACK information is received or not, which are multiplexed into the PUSCH transmission in the third repetition unit, is defined as N3; and the number of PDSCHs indicating whether the HARQ-ACK information is received or not, which are multiplexed into the PUSCH transmission in the fourth repetition unit, is defined as N4. In this case, the terminal may assume that the remainder obtained when dividing each of N1, N2, N3, and N4 by 4 is the value indicated by the value of the UL-DAI field. For example, if the value of the UL-DAI field is 0 (00 b ), the UE can determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed in the first, second, third, and fourth repetition units is divided by 4 is 1 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 1, 5, 9, ...).b ), the UE can determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed in each of the first, second, third, and fourth repetition units is divided by 4 is 2 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 2, 6, 10, ...). b ), the UE can determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed in the first, second, third, and fourth repetition units is divided by 4 is 3 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 3, 7, 11, ...). b ), the UE may determine that the remainder when the number of PDSCHs corresponding to HARQ-ACKs multiplexed into the first, second, third, and fourth repetition units is divided by 4 is 0 (i.e., the number of PDSCHs corresponding to HARQ-ACKs is one of 0, 4, 8, ...). The number of PDSCHs corresponding to HARQ-ACKs multiplexed into each repetition unit may be different. Also, as in the embodiment described in FIG. 13, the UE may determine whether to multiplex HARQ-ACK information into PUSCH transmission across multiple repetition units in which PUSCH transmission is performed. In this case, the UE may multiplex HARQ-ACK information into PUSCH transmission by applying the value of the UL-DAI field to each repetition unit in which HARQ-ACK information is multiplexed into PUSCH transmission. Specifically, even if there is no PDSCH corresponding to the HARQ-ACK information of the PUCCH transmission of a particular repetition unit, the terminal can multiplex the HARQ-ACK information into the PUSCH transmission of the corresponding repetition unit.

[0152] In the above embodiment, the number of PDSCHs corresponding to each of the multiple PUCCH transmissions overlapping with the PUSCH transmission may be different. For example, a PUSCH transmission overlaps with a PUCCH transmission in two slots. In this case, there may be eight PDSCHs corresponding to the HARQ-ACK information of the first PUCCH transmission overlapping with the PUSCH transmission in the first slot, and there may be five PDSCHs corresponding to the HARQ-ACK information of the second PUCCH transmission overlapping with the PUSCH repeat transmission in the second slot. When the value of the UL-DAI field of the DCI scheduling the PUSCH transmission is 4 (i.e., 11), b), the terminal can determine that there are eight PDSCHs corresponding to the first PUCCH and eight PDSCHs corresponding to the second PUCCH. In addition, the terminal may fail to receive DCI scheduling PDSCHs corresponding to HARQ-ACK information of the second PUCCH transmission overlapped with the PUSCH repetition transmission in the second slot. In this case, the terminal can determine that the number of PDSCHs corresponding to the second PUCCH is four, which is a number smaller than eight. As a result, confusion may occur between the terminal and the base station regarding the number of PDSCHs indicating whether or not HARQ-ACK information multiplexed into PUSCH transmission is received. Therefore, the terminal can set the number of PDSCHs corresponding to HARQ-ACK information of a slot having the largest number of PDSCHs corresponding to HARQ-ACK information among HARQ-ACK information of PUCCHs overlapped with PUSCH transmissions on multiple slots as the number of bits of all HARQ-ACK information multiplexed into PUSCH transmission. The UE may set the number of HARQ-ACK information bits to be multiplexed into each PUSCH transmission to be the same as the number of HARQ-ACK information bits of the HARQ-ACK information of the slot with the largest number of HARQ-ACK information bits among the HARQ-ACK information of the PUCCH overlapping with the PUSCH transmission on multiple slots. In this embodiment, the UE may set the HARQ-ACK information bit for which the DCI that scheduled the reception of the corresponding PDSCH was not received as NACK. In this embodiment, since the base station knows the number of PDSCH transmissions scheduled by the base station, it can predict the number of HARQ-ACK information bits corresponding to whether or not a PDSCH transmission has been received in each slot. Therefore, this embodiment can prevent confusion between the UE and the base station regarding the number of PDSCHs for which HARQ-ACK information multiplexed into a PUSCH transmission indicates successful or unsuccessful reception.

[0153] When the PUSCH is repeatedly transmitted within one slot, the above-described embodiment may be applied based on a repetition unit rather than a slot. The UE may set the number of PDSCHs corresponding to the HARQ-ACK information of the repetition unit having the largest number of PDSCHs corresponding to the HARQ-ACK information among the HARQ-ACK information of the PUCCHs overlapping with the PUSCH transmissions transmitted in multiple repetition units as the number of bits of all HARQ-ACK information multiplexed into the PUSCH transmission. The UE may set the same number of bits as the HARQ-ACK information of the repetition unit having the largest number of HARQ-ACK information bits among the HARQ-ACK information of the PUCCHs overlapping with the PUSCH transmissions transmitted in multiple repetition units as the number of bits of HARQ-ACK information multiplexed into each PUSCH transmission. In such an embodiment, the UE may set the bit of HARQ-ACK information for which the UE did not receive the DCI that scheduled the reception of the corresponding PDSCH as NACK.

[0154] In another specific embodiment, the terminal may determine that the value of the 2-bit UL-DAI field is information regarding the HARQ-ACK information of all PUCCH transmissions overlapped with the PUSCH transmission. Specifically, the terminal may determine that the value of the 2-bit UL-DAI field indicates the remainder when the sum of the numbers of PDSCHs corresponding to the HARQ-ACK information of all PUCCH transmissions overlapped with the PUSCH transmission is divided by 4. For example, assume that PUSCH transmission is performed over four slots, and the numbers of PDSCHs (or the numbers of HARQ-ACK bits) corresponding to the HARQ-ACK information of the four PUCCH transmissions overlapped with the PUSCH transmission over the four slots are N1, N2, N3, and N4. In this case, the terminal may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH transmission indicates the value of N1+N2+N3+N4 divided by 4. When the value of the UL-DAI field is 4 (i.e., 11), b), the terminal can determine that the remainder when N1+N2+N3+N4 is divided by 4 is 0. Therefore, the terminal can multiplex HARQ-ACK information, which indicates whether a multiple of 4 PDSCHs have been successfully received, into the PUSCH transmission.

[0155] In another specific embodiment, PUSCH transmission is performed in four repetition units, and the numbers of PDSCHs (or the numbers of HARQ-ACK bits) corresponding to the HARQ-ACK information of four PUCCH transmissions overlapped with PUSCH transmission in four repetition units are N1, N2, N3, and N4. In this case, the terminal may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH transmission indicates a value obtained by dividing N1+N2+N3+N4 by 4. When the value of the UL-DAI field is 0 (i.e., 00 b ), the terminal can determine that the remainder when N1+N2+N3+N4 is divided by 4 is 1. If the value of the UL-DAI field is 1 (i.e., 01 b ), the terminal can determine that the remainder when N1+N2+N3+N4 is divided by 2 is 0. If the value of the UL-DAI field is 2 (i.e., 10 b ), the terminal can determine that the remainder when N1+N2+N3+N4 is divided by 4 is 3. If the value of the UL-DAI field is 3 (i.e., 11 b), the terminal may determine that the remainder when N1+N2+N3+N4 is divided by 4 is 0. Therefore, the terminal may multiplex HARQ-ACK information indicating whether a multiple of 4 PDSCHs have been successfully received into the PUSCH transmission. As described above, when the base station schedules PUSCH transmission on multiple slots, the base station may schedule PUSCH transmission or PUCCH transmission such that the number of slots in which the corresponding PUSCH transmission and PUCCH transmission overlap is equal to or less than a certain number. When PUSCH transmission is performed on multiple slots, the terminal may assume that the corresponding PUSCH transmission and PUCCH transmission may overlap in a certain number of slots or less. In this case, the certain number may be 1. In such an embodiment, the terminal may determine that the value of the UL-DAI field of the DCI scheduling PUSCH transmission indicates information regarding the number of bits of HARQ-ACK information to be transmitted along with the PUCCH transmission in one slot in which the PUSCH transmission and the PUCCH transmission overlap. Specifically, the terminal may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH transmission indicates a remainder when the number of bits of HARQ-ACK information shared with PUCCH transmission in one slot in which the PUSCH transmission and the PUCCH transmission overlap is divided by 4. In addition, when the PUSCH is repeatedly transmitted in one slot, the base station may schedule the PUSCH transmission or the PUCCH transmission such that the number of repetition units in which the corresponding PUSCH transmission and the PUCCH transmission overlap is equal to or less than a certain number. In this case, the terminal may assume that the corresponding PUSCH transmission and the PUCCH transmission may overlap in repetition units equal to or less than a certain number. In this case, the certain number may be 1. In such an embodiment, the terminal may determine that the value of the UL-DAI field of the DCI scheduling the PUSCH transmission indicates information regarding the number of bits of HARQ-ACK information shared with PUCCH transmission in one repetition unit in which the PUSCH transmission and the PUCCH transmission overlap.Specifically, the terminal can determine that the value of the UL-DAI field of the DCI that schedules the PUSCH transmission indicates the remainder when the number of bits of HARQ-ACK information that accompanies the PUCCH transmission in one repetition unit in which the PUSCH transmission and the PUCCH transmission overlap is divided by 4.

[0156] In another specific embodiment, when PUSCH transmission is performed in multiple slots and a HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be determined by the number of slots in which PUSCH transmission is performed. Specifically, the number of bits of the UL-DAI field may be proportional to the number of slots in which PUSCH transmission is performed. In a specific embodiment, when a dynamic HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be a value obtained by multiplying the number of slots in which PUSCH transmission is performed by 2. In this case, each 2-bit subfield of the UL-DAI field may indicate a remainder when the number of bits of HARQ-ACK information multiplexed into PUSCH transmission in each slot in which PUSCH transmission is performed is divided by 4. For example, when PUSCH transmission is configured to be performed in four slots and a dynamic HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be 8. In this case, each 2-bit subfield of the UL-DAI field may indicate HARQ-ACK information multiplexed onto PUSCH transmission in each of the four slots where PUSCH transmission is performed. In a specific embodiment, when a semi-static HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be the same as the number of slots where PUSCH transmission is performed. In this case, each bit of the UL-DAI field may indicate whether HARQ-ACK information is multiplexed onto PUSCH transmission in each of the slots where PUSCH transmission is performed. For example, when PUSCH transmission is configured to be performed over four slots and a semi-static HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be 4. In this case, each bit of the UL-DAI field may indicate whether HARQ-ACK information is multiplexed onto PUSCH transmission in each of the four slots where PUSCH transmission is performed.

[0157] Furthermore, when PUSCH is repeatedly transmitted within one slot, the number of bits of the UL-DAI field may be determined according to the number of repetition units in which PUSCH transmission is performed. Specifically, the number of bits of the UL-DAI field may be proportional to the number of repetition units in which PUSCH transmission is performed. In a specific embodiment, when a dynamic HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be a value obtained by multiplying the number of repetition units in which PUSCH transmission is performed by 2. In this case, each 2-bit subfield of the UL-DAI field may indicate a remainder when the number of bits of HARQ-ACK information multiplexed into PUSCH transmission in each repetition unit in which PUSCH transmission is performed is divided by 4. For example, when PUSCH transmission is configured to be performed over 4 repetition units and a dynamic HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be 8. In this case, each 2-bit subfield of the UL-DAI field may indicate HARQ-ACK information multiplexed into PUSCH transmission in each of 4 repetition units in which PUSCH transmission is performed. In a specific embodiment, when a semi-static HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be equal to the number of repetition units in which PUSCH transmission is performed. In this case, each bit of the UL-DAI field may indicate whether HARQ-ACK information is multiplexed onto PUSCH transmission for each repetition unit in which PUSCH transmission is performed. For example, when PUSCH transmission is configured to be performed over four repetition units and a semi-static HARQ-ACK codebook is configured, the number of bits of the UL-DAI field may be 4. In this case, each bit of the UL-DAI field may indicate whether HARQ-ACK information is multiplexed onto PUSCH transmission for each of four repetition units in which PUSCH transmission is performed. In the above embodiment, the UE multiplexes HARQ-ACK information onto PUSCH transmission over multiple slots.The above-described embodiment can also be applied when the UE multiplexes uplink control information (UCI) into a PUSCH transmission. The UCI may include CSI / SR. The UE can multiplex the UCI into at least one of a plurality of slots in which PUSCH transmission is performed. When the UE multiplexes UCI into PUSCH transmission in a plurality of slots, the UE can set the number of bits of the UCI to be the same. Specifically, when the UE multiplexes UCI into PUSCH transmission in a plurality of slots, the UE can set the number of bits of all UCI multiplexed into the PUSCH transmission to the maximum number of bits of UCI multiplexed into the PUSCH transmission. In this case, the UE can pad the UCI with zeros and set the number of bits of all UCI multiplexed into the PUSCH transmission to the maximum number of bits of UCI multiplexed into the PUSCH transmission. Specifically, the UE may add a bit indicating NACK to the HARQ-ACK information of the UCI, and set the number of UCI bits multiplexed into the PUSCH transmission to the maximum number of UCI bits multiplexed into the PUSCH transmission. In addition, when the PUSCH is repeatedly transmitted within one slot, the UE may multiplex the UCI in at least one of a plurality of repetition units in which the PUSCH transmission is performed. When the UE multiplexes UCI into the PUSCH transmission in a plurality of repetition units, the UE may set the number of UCI bits to be the same. Specifically, when the UE multiplexes UCI into the PUSCH transmission in a plurality of repetition units, the UE may set the number of all UCI bits multiplexed into the PUSCH transmission to the maximum number of UCI bits multiplexed into the PUSCH transmission. In this case, the UE may pad the UCI with zeros, and set the number of all UCI bits multiplexed into the PUSCH transmission to the maximum number of UCI bits multiplexed into the PUSCH transmission.Specifically, the terminal may add a bit indicating NACK to the HARQ-ACK information of the UCI, and set the number of bits of the UCI multiplexed into the PUSCH transmission to the maximum number of bits of the UCI multiplexed into the PUSCH transmission.

[0158] When the UE multiplexes UCI into PUSCH transmission in multiple slots, the UE may multiplex UCI by arranging it in REs at the same positions (or in the same pattern) in all slots in which the UCI is multiplexed. Specifically, the UE may transmit UCI in REs corresponding to the union of REs corresponding to all UCIs multiplexed into PUSCH transmission, and transmit PUSCH in the remaining REs.

[0159] In some of the above-described embodiments, the UE may multiplex HARQ-ACK information into PUSCH transmission in slots where a PUCCH including HARQ-ACK information would not be transmitted if there was no PUSCH transmission (absent). In this case, the UE may multiplex HARQ-ACK information including only NACK into PUSCH transmission in slots where a PUCCH with HARQ-ACK information would not be transmitted if there was no PUSCH transmission. Specifically, the UE may multiplex HARQ-ACK information valid for PUSCH transmission in slots that meet the PDSCH processing time. In this case, the UE may multiplex HARQ-ACK information, in which the success or failure of reception of the corresponding PDSCH is set to NACK, into PUSCH transmission in slots that do not meet the PDSCH processing time.

[0160] In addition, the UE may multiplex HARQ-ACK information valid for PUSCH transmission in a slot indicated by the value of the PDSCH-to-HARQ_feeback timing indicator field of the DCI scheduling the PDSCH. In this case, the UE may multiplex HARQ-ACK information, in which the success or failure of reception of the corresponding PDSCH is set to NACK, into PUSCH transmission in slots other than the slot indicated by the value of the PDSCH-to-HARQ_feeback timing indicator field of the DCI scheduling the PDSCH. In another specific embodiment, the UE may multiplex HARQ-ACK information valid for PUSCH transmission in a slot indicated by the value of the PDSCH-to-HARQ_feeback timing indicator field of the DCI scheduling the PDSCH and after the slot. In this case, the terminal can multiplex HARQ-ACK information, in which the reception status of the corresponding PDSCH is set to NACK, into the PUSCH transmission in a slot before the slot indicated by the value of the PDSCH-to-HARQ_feeback timing indicator field of the DCI that schedules the PDSCH.

[0161] In the embodiment described in FIG. 12, if a PDCCH or PDSCH satisfying the HARQ-ACK timing for a specific slot is not received, the UE does not multiplex HARQ-ACK information into PUSCH transmission in the corresponding slot. In another specific embodiment, the UE may multiplex valid HARQ-ACK information into PUSCH transmission in slots indicated by the PDSCH-to-HARQ_feeback timing indicator field of the DCI scheduling the PDSCH transmission. In this case, the UE may multiplex HARQ-ACK information, in which the success or failure of reception of the corresponding PDSCH is set to NACK, into PUSCH transmission in slots other than the slot indicated by the PDSCH-to-HARQ_feeback timing indicator value of the DCI scheduling the PDSCH.

[0162] In the embodiment described in Figure 13, for a PDSCH whose reception success or failure is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission in the preceding slot, the HARQ-ACK information multiplexed in the subsequent slot does not indicate the reception success or failure. In another specific embodiment, for a PDSCH whose reception success or failure is indicated by the HARQ-ACK information multiplexed into the PUSCH transmission in the preceding slot, the HARQ-ACK information multiplexed in the subsequent slot indicates NACK.

[0163] Furthermore, when the UE calculates the number of HARQ-ACK information bits to determine whether multiplexing is necessary, the UE may exclude HARQ-ACK information set as NACK regardless of whether PDSCH reception is successful, as in the above-described embodiment, from the calculation of the number of HARQ-ACK bits. For example, if the total number of HARQ-ACK information bits to be multiplexed into PUSCH transmission by the UE is A and the number of bits set as NACK regardless of whether PDSCH reception is successful is B, the UE may determine the number of valid HARQ-ACK information bits to be multiplexed into PUSCH transmission based on A and B. The UE may determine the amount of resources to be multiplexed into PUSCH transmission using the number of valid HARQ-ACK information bits. The amount of multiplexed resources may represent the number of REs transmitting HARQ-ACK information. The amount of multiplexed resources may increase in proportion to the value A and B. More specifically, when the target code rate for transmitting HARQ-ACK information is set as a, the number of REs transmitting HARQ-ACK information may be (AB) / (Modulation_order*a), where Modulation_order represents the modulation order of HARQ-ACK information multiplexed onto PUSCH. For example, if AB is 0, the UE does not need to multiplex HARQ-ACK information onto PUSCH transmission because there is no valid HARQ-ACK information.

[0164] As described above, if a PUCCH transmission with HARQ-ACK information overlaps with a PUSCH transmission in the time domain, the UE can multiplex the HARQ-ACK information with the PUSCH transmission. Also, if a PUCCH transmission with HARQ-ACK information overlaps with another PUCCH transmission in the time domain, the UE can multiplex the HARQ-ACK information with the other PUCCH transmission. When the UE multiplexes HARQ-ACK information with a PUSCH transmission or another PUCCH transmission in any one slot, the UE can perform multiplexing if the corresponding slot satisfies the processing timing conditions of the PDSCH, the reception success or failure of which is indicated by the HARQ-ACK, and the PDCCH, which schedules the PUCCH transmission including the HARQ-ACK. This will be described with reference to Figures 16 to 18.

[0165] Figure 16 shows a method for determining whether HARQ-ACK information multiplexing is possible when a terminal according to an embodiment of the present invention multiplexes HARQ-ACK information into PUSCH transmission, based on the last symbol of a PDSCH in which the success or failure of reception is indicated by the HARQ-ACK information and the last symbol of a PDCCH in which a PUCCH including HARQ-ACK information is scheduled.

[0166] The UE may multiplex HARQ-ACK information into physical channel transmission based on the position of the last symbol of the PDSCH for which the success or failure of reception is indicated by the HARQ-ACK information, and the position of the earliest symbol among the start symbol of the PUCCH including the HARQ-ACK information and the start symbol of the physical channel transmission used for HARQ-ACK information multiplexing. If the position of the earliest symbol among the first symbol of the PUCCH including the HARQ-ACK information and the first symbol of another PUCCH is N1 from the last symbol of the PDSCH for which the success or failure of reception is indicated by the HARQ-ACK information, + +d 1,1 +d 1,2If the first symbol of the PUCCH containing the HARQ-ACK information is located more than N1 symbols after the last symbol of the PDSCH, the UE can transmit the HARQ-ACK information via the PUCCH. + +d 1,1 +d 1,2 If the HARQ-ACK information is located at least one symbol later, the UE can transmit the HARQ-ACK information via the PUSCH. + is N1+1. The N1 value is in accordance with Table 4.

[0167] [Table 4]

[0168] In Table 4, μ is either the subcarrier spacing of the PDCCH or the subcarrier spacing of the UL BWP where HARQ-ACK information is transmitted. proc,1 The value that maximizes T proc,1 T may represent the minimum time required for a terminal to receive a PDSCH and generate a valid HARQ-ACK for the PDSCH. proc,1 may be determined by the following formula:

[0169]

number

[0170] Also, d 1,1 is 0 if HARQ-ACK information is transmitted via PUCCH, and is 1 if HARQ-ACK information is transmitted via PUSCH. 1,2 If the PDSCH mapping type is A and the last symbol of the PDSCH is the i-th symbol before the 7th symbol, then d 1,2 =7-i is fine. d 1,2If the PDSCH mapping type is B and the PDSCH length is 4 symbols, then d 1,2 = 3. If the length of PDSCH is 2 symbols, d 1,2 = 3 + d, where d is the number of symbols by which the PDSCH, PDSCH, and PDCCH overlap. The PDSCH mapping type may be indicated by DCI. The position of the first DMRS of the PDSCH may be determined according to the PDSCH mapping type. Specifically, when the PDSCH mapping type is A, the first DMRS of the PDSCH is at a fixed position in a slot. Also, when the PDSCH mapping type is B, the first DMRS of the PDSCH starts from the first symbol of the scheduled PDSCH.

[0171] The terminal may perform physical channel transmission multiplexing of the HARQ-ACK channel based on the position of the last symbol of the PDCCH that schedules the transmission of the PUCCH that includes the HARQ-ACK information and the position of the preceding symbol among the start symbol of the PUCCH that includes the HARQ-ACK information and the start symbol of the corresponding physical channel transmission. Specifically, the preceding symbol among the start symbol of the PUCCH that includes the HARQ-ACK information and the start symbol of another PUCCH may be N2 from the last symbol of the PDCCH that schedules the transmission of the PUCCH that includes the HARQ-ACK information. + +d 2,1 If the leading symbol of the PUSCH is located more than N2 symbols after the last symbol of the PDCCH that schedules the corresponding PUSCH, the UE can transmit HARQ-ACK information via the PUCCH. + +d 2,1 If the HARQ-ACK information is located at least N symbols later, the terminal can transmit the HARQ-ACK information via the PUCCH. + is N2 + 1. The N2 value is in accordance with Table 5.

[0172] [Table 5]

[0173] In the embodiment of Figure 16, the symbol interval between the last symbol of the PDSCH, in which the success or failure of reception is indicated by the HARQ-ACK information, and the first symbol of the PUCCH containing the HARQ-ACK information, and the preceding symbol (Reference Point) of the first symbol of the PUSCH, satisfies the above-mentioned condition. Also, the symbol interval between the last symbol of the PDCCH, which schedules the PUSCH transmission, and the first symbol of the PUCCH containing the HARQ-ACK information, and the preceding symbol of the first symbol of the PUSCH, satisfies the above-mentioned condition. Therefore, the terminal multiplexes the HARQ-ACK transmission with the PUSCH transmission. Also, in this embodiment, the terminal does not need to expect the PUSCH transmission and the PUCCH transmission to overlap, which do not satisfy the above-mentioned condition.

[0174] When a semi-static HARQ-ACK codebook is configured, the DCI scheduling the PDSCH may indicate HARQ-ACK timing in the PDSCH-to-HARQ_feeback timing indicator field. The HARQ-ACK timing indicates the slot interval between the PDSCH transmission and the PUCCH transmission including HARQ-ACK information indicating whether the PDSCH is successfully received. The HARQ-ACK timing is set without considering the last symbol-related conditions of the PDSCH. Therefore, a problem occurs when the PDSCH, the reception of which is indicated by the HARQ-ACK information indicated by the HARQ-ACK timing, does not satisfy the last symbol-related conditions of the PDSCH. This is because the UE cannot multiplex HARQ-ACK information including whether the PDSCH is successfully received or not, into the PUSCH transmission or PUCCH transmission. This will be described with reference to FIG. 17.

[0175] FIG. 17 illustrates a method in which, when a terminal according to an embodiment of the present invention multiplexes HARQ-ACK information into PUSCH transmission, the terminal multiplexes HARQ-ACK information based on HARQ-ACK timing and the last symbol of a PDSCH in which the success or failure of reception is indicated by the HARQ-ACK information.

[0176] If a PDSCH indicated by the HARQ-ACK information as indicating whether reception is successful or not according to the HARQ-ACK timing does not satisfy the above-mentioned last symbol related condition of the PDSCH, the terminal can set the reception success or failure of the PDSCH in the HARQ-ACK information as NACK regardless of whether reception of the corresponding PDSCH is successful or not. The base station can expect to set the reception success or failure of the corresponding PDSCH in the HARQ-ACK information as NACK. As described above, the last symbol related condition of the PDSCH is that the position of the preceding symbol among the first symbol of the PUCCH including the HARQ-ACK information and the first symbol of another PUCCH is N1 from the last symbol of the PDSCH for which reception success or failure is indicated by the HARQ-ACK information. + +d 1,1 +d 1,2 It can be located more than one symbol behind.

[0177] In the embodiment of Figure 17, the PDSCHs indicated by the HARQ-ACK timing are the first PDSCH (PDSCH #1) and the second PDSCH (PDSCH #2). Of the last symbol of the PDSCH, the first symbol of the PUCCH containing the HARQ-ACK information, and the first symbol of the PUSCH, the interval between the preceding symbol (Reference Point) and the last symbol of the first PDSCH (PDSCH #1) is N1 + +d 1,1 +d 1,2In addition, the interval between the preceding symbol (Reference Point) and the last symbol of the second PDSCH (PDSCH#2) among the last symbol of the PDSCH in which the success or failure of reception is indicated by the HARQ-ACK information, the first symbol of the PUCCH containing the HARQ-ACK information, and the first symbol of the PUSCH is N1 + +d 1,1 +d 1,2 In addition, the symbol interval between the last symbol of the PDCCH that schedules the PUSCH transmission, the first symbol of the PUCCH that includes the HARQ-ACK information, and the first symbol of the PUSCH is N2+d 2,1 Therefore, the terminal can multiplex, into PUSCH transmission, HARQ-ACK information in which the success or failure of reception of the second PDSCH (PDSCH#2) is set as NACK and the success or failure of reception of the first PDSCH (PDSCH#1) is set depending on the success or failure of reception of the first PDSCH (PDSCH#1).

[0178] In another specific embodiment, if a PDSCH indicated by the HARQ-ACK timing as indicating whether reception is successful or not by the HARQ-ACK information does not satisfy the above-mentioned last symbol-related condition of the PDSCH, the UE does not multiplex the HARQ-ACK information indicating whether reception of the corresponding PDSCH is successful or not into a physical channel transmission. In the embodiment of FIG. 17, the UE multiplexes the HARQ-ACK information indicating whether reception of the first PDSCH (PDSCH #1) is successful or not into a PUSCH, and does not multiplex the HARQ-ACK information indicating whether reception of the second PDSCH (PDSCH #2) is successful or not into a PUSCH. In such an embodiment, the UE does not transmit invalid HARQ-ACK information, thereby reducing the size of UL overhead.

[0179] FIG. 18 illustrates a method for multiplexing HARQ-ACK information into PUSCH transmission in a terminal according to another embodiment of the present invention. proc,1This section shows a method for multiplexing HARQ-ACK information based on the last symbol of the PDSCH, which indicates whether reception was successful or not, and the HARQ-ACK information.

[0180] The terminal may not need to determine the last symbol-related condition for the PDSCH corresponding to invalid HARQ-ACK information. proc,1 HARQ-ACK information that does not satisfy the conditions can be determined as invalid HARQ-ACK information. proc,1 The condition is that the interval between the last symbol of the PDSCH, which indicates whether reception is successful or not by the HARQ-ACK information, and the first symbol of the PUCCH, which includes the HARQ-ACK information, is T proc,1 It can be expressed as being greater than T proc,1 can be expressed by the above-mentioned formula. Specifically, the terminal receives the first symbol of the PUCCH including the HARQ-ACK and T proc,1 The HARQ-ACK information, which is located between the previous symbol and indicates whether the PDSCH has been successfully received, can be determined to be invalid HARQ-ACK information. proc,1 HARQ-ACK information that does not satisfy the conditions is set as NACK.

[0181] In the embodiment of FIG. 18, the interval from the last symbol of the first PDSCH (PDSCH#1) to the first symbol of the PUCCH containing the HARQ-ACK is T proc,1 In addition, the interval from the last symbol of the second PDSCH (PDSCH#2) to the first symbol of the PUCCH including the HARQ-ACK is greater than T proc,1 In addition, the symbol interval between the last symbol of the PDCCH that schedules the PUSCH transmission and the first symbol of the PUCCH that includes the HARQ-ACK information or the smallest symbol of the PUSCH is smaller than N2+d 2,1Therefore, the terminal can multiplex HARQ-ACK information, in which the success or failure of reception of the second PDSCH (PDSCH#2) is set as NACK and the success or failure of reception of the first PDSCH (PDSCH#1) is set depending on the success or failure of reception of the first PDSCH (PDSCH#1), into PUSCH transmission. Also, the terminal does not need to determine the last symbol-related condition of the PDSCH described above for the second PDSCH (PDSCH#2).

[0182] In another specific embodiment, the terminal may multiplex the remaining HARQ-ACK information of the PUCCH transmission overlapped with the PUSCH transmission, excluding invalid HARQ-ACK information, into the physical channel transmission. proc,1 The remaining HARQ-ACK information, excluding the HARQ-ACK information that does not satisfy the conditions, can be multiplexed into a physical channel transmission. According to the embodiment of Figure 18, the terminal can multiplex only the HARQ-ACK information indicating whether the first PDSCH (PDSCH #1) was successfully received into a PUSCH transmission, excluding the HARQ-ACK information indicating whether the second PDSCH (PDSCH #2) was successfully received. According to this embodiment, the terminal can reduce the size of UL overhead.

[0183] In the above embodiment, the terminal can determine the last symbol-related condition of the PDSCH only for the PDSCH indicated by the successfully received PDCCH. When a semi-static HARQ-ACK codebook is configured, HARQ-ACK information indicating the success or failure of reception of the PDSCH indicated by the unsuccessfully received PDCCH or the PDSCH indicated by the PDCCH not transmitted by the base station may be included in the semi-static HARQ-ACK codebook. In this case, the terminal can determine the last symbol-related condition of the PDSCH only for the PDSCH indicated by the successfully received PDCCH. In other words, the terminal does not receive the PDSCH indicated by the unsuccessfully received PDCCH.

[0184] In the above-mentioned embodiment, d 1,1 The value of d 1,1 is the maximum value that d can have and may be fixed. 1,2 The value of d 1,2 is the maximum value that the terminal can have, and may be fixed. If the terminal does not receive a PDCCH that schedules a PDSCH, d 1,1 The value of d 1,2 In the above embodiment, the value of d 1,1 can be 1. Also, d 1,2 can be 6 or 5.

[0185] In the above-described embodiments, the physical data channel may include a PDSCH or a PUSCH, and the physical control channel may include a PDCCH or a PUCCH. In addition, in the embodiments described with reference to a PUSCH, a PDCCH, a PUCCH, and a PDCCH, other types of data channels and control channels may also be applied.

[0186] Although the method and system of the present invention have been described in connection with particular embodiments, some or all of its components or operations may be implemented using a computer system having a general-purpose hardware architecture.

[0187] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive. For example, each component described as a single component may be implemented in a distributed form, and similarly, components described as distributed may be implemented in a combined form.

[0188] The scope of the present invention is represented by the claims set forth below rather than by the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalents should be interpreted as being included within the scope of the present invention. [Explanation of symbols]

[0189] 100 devices 110 processors 120 Communication Module 121,122 Cellular communication interface card 123 Unlicensed Spectrum Communication Interface Card 130 memory 140 User Interface 150 display units 200 base stations 210 processor 220 Communication Module 221,222 Cellular communication interface card 223 Unlicensed Spectrum Communication Interface Card 230 memory

Claims

1. A terminal of a wireless communication system, comprising: a communication module; a processor that controls the communication module; Including, The processor: receiving control information on a physical downlink control channel (PDCCH) that schedules transmission of a physical uplink shared channel (PUSCH) in a plurality of slots; Identifying the number of physical uplink shared channels (PDSCHs) transmitting hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information in each of at least one slot among the plurality of slots according to a specific value indicated by a downlink assignment index (DAI) field of the control information; Transmitting the PUSCH in the plurality of slots; the HARQ-ACK information is multiplexed with the PUSCH in the at least one slot among the plurality of slots; The at least one slot is determined according to whether the HARQ-ACK information is multiplexed onto the PUSCH for each of the plurality of slots.

2. The terminal of claim 1, wherein the HARQ-ACK information is multiplexed onto the PUSCH in each of the at least one slot by applying the same value as the specific value of the DAI field included in the control information.

3. When the two bits of the DAI field are '00', the specific value is '1'; When the two bits of the DAI field are "01", the specific value is "2", When the two bits of the DAI field are "10", the specific value is "3", 2. The terminal of claim 1, wherein when two bits of the DAI field are "11", the specific value is "4".

4. The terminal of claim 1 , wherein the at least one slot is determined by excluding one or more slots that satisfy a specific condition in which HARQ-ACK information cannot be multiplexed with PUSCH in the plurality of slots.

5. The specific conditions are: There is no PUSCH transmission in the one or more slots; No PDSCH is received in the one or more slots; or The PDCCH that schedules the transmission of a physical uplink control channel (PUCCH) including the HARQ-ACK information in the one or more slots has not been received; The terminal according to claim 4, wherein success or failure of reception of the PDSCH is indicated by the HARQ-ACK information.

6. 2. The terminal according to claim 1, wherein, in a slot not indicated by a PDSCH-to-HARQ_feedback timing indicator field in the control information for scheduling a PDSCH among the at least one slot, the HARQ-ACK information of the PDSCH set to NACK in transmission of the PUSCH is multiplexed.

7. The HARQ-ACK information is multiplexed into the PUSCH in the at least one slot according to whether the at least one slot satisfies a processing timing condition of the PDCCH that schedules transmission of a PDSCH and a PUCCH (physical uplink control channel) included in the HARQ-ACK information; The success or failure of reception of the PDSCH is indicated by the HARQ-ACK information, The terminal of claim 1, wherein the processing timing condition is determined by a minimum time it takes for the terminal to receive the PDCCH and generate valid HARQ-ACK information.

8. The terminal of claim 7, wherein if the at least one slot does not satisfy the processing timing condition, the HARQ-ACK information is not multiplexed onto the PUSCH in the at least one slot.

9. The terminal according to claim 7, wherein the HARQ-ACK information corresponding to the PDSCH that does not satisfy the processing timing condition is set to NACK.

10. The terminal of claim 7, wherein the processing timing condition is determined based on the position of the last symbol of the PDSCH, whose reception success or failure is indicated by the HARQ-ACK information, and the position of the preceding symbol among the start symbol of the PUCCH including the HARQ-ACK information and the start symbol of the transmission of the PUSCH in the plurality of slots.

11. 1. A method of operating a terminal in a wireless communications system, comprising: receiving control information on a physical downlink control channel (PDCCH) that schedules transmission of a physical uplink shared channel (PUSCH) in a plurality of slots; identifying a number of physical uplink shared channels (PDSCHs) transmitting hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information in each of at least one slot among the plurality of slots according to a specific value indicated by a downlink assignment index (DAI) field of the control information; transmitting the PUSCH in the plurality of slots; Including, the HARQ-ACK information is multiplexed with the PUSCH in the at least one slot among the plurality of slots; The at least one slot is determined according to whether the HARQ-ACK information is multiplexed onto the PUSCH for each of the plurality of slots.

12. The method of claim 11, wherein the HARQ-ACK information is multiplexed onto the PUSCH in each of the at least one slot by applying the same value as the specific value of the DAI field included in the control information.

13. When the two bits of the DAI field are '00', the specific value is '1'; When the two bits of the DAI field are "01", the specific value is "2", When the two bits of the DAI field are "10", the specific value is "3", 12. The method of claim 11, wherein when the two bits of the DAI field are "11", the specific value is "4".

14. The method of claim 11, wherein the at least one slot is determined by excluding one or more slots that meet a specific condition that prevents HARQ-ACK information from being multiplexed with PUSCH in the plurality of slots.

15. The specific conditions are: There is no PUSCH transmission in the one or more slots; No PDSCH is received in the one or more slots; or The PDCCH that schedules the transmission of a physical uplink control channel (PUCCH) including the HARQ-ACK information in the one or more slots has not been received; The method of claim 14, wherein the success or failure of reception of the PDSCH is indicated by the HARQ-ACK information.

16. 12. The method of claim 11, wherein the HARQ-ACK information of the PDSCH, which is set to NACK in the transmission of the PUSCH, is multiplexed in a slot that is not indicated by a PDSCH-to-HARQ_feedback timing indicator field in the control information for scheduling the PDSCH, among the at least one slot.

17. The HARQ-ACK information is multiplexed into the PUSCH in the at least one slot according to whether the at least one slot satisfies a processing timing condition of the PDCCH that schedules transmission of a PDSCH and a PUCCH (physical uplink control channel) included in the HARQ-ACK information; The success or failure of reception of the PDSCH is indicated by the HARQ-ACK information, The method of claim 11, wherein the processing timing condition is determined by a minimum time it takes for the terminal to receive the PDCCH and generate valid HARQ-ACK information.

18. The method of claim 17, further comprising not multiplexing the HARQ-ACK information onto the PUSCH in the at least one slot if the at least one slot does not satisfy the processing timing condition.

19. The method of claim 17, wherein the HARQ-ACK information corresponding to the PDSCH that does not satisfy the processing timing condition is set to NACK.

20. The method of claim 17, wherein the processing timing condition is determined based on the position of the last symbol of the PDSCH, the success or failure of reception of which is indicated by the HARQ-ACK information, and the position of the preceding symbol among the start symbol of the PUCCH including the HARQ-ACK information and the start symbol of the transmission of the PUSCH in the plurality of slots.

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